1200551331 has 8 divisors (see below), whose sum is σ = 1829411584. Its totient is φ = 686029320.

The previous prime is 1200551257. The next prime is 1200551333. The reversal of 1200551331 is 1331550021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1200551331 - 2¹⁷ = 1200420259 is a prime.

It is a super-2 number, since 2×1200551331² = 2882646996731743122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 57169111 = 1200551331 / (1 + 2 + 0 + 0 + 5 + 5 + 1 + 3 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 1200551298 and 1200551307.

It is not an unprimeable number, because it can be changed into a prime (1200551333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28584535 + ... + 28584576.

It is an arithmetic number, because the mean of its divisors is an integer number (228676448).

Almost surely, 2^1200551331 is an apocalyptic number.

1200551331 is a deficient number, since it is larger than the sum of its proper divisors (628860253).

1200551331 is an equidigital number, since it uses as much as digits as its factorization.

1200551331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57169121.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 1200551331 is about 34648.9730150837. The cubic root of 1200551331 is about 1062.8212877684.

It can be divided in two parts, 12005 and 51331, that added together give a palindrome (63336).

The spelling of 1200551331 in words is "one billion, two hundred million, five hundred fifty-one thousand, three hundred thirty-one".