31201144420 has 12 divisors (see below), whose sum is σ = 65522403324. Its totient is φ = 12480457760.

The previous prime is 31201144417. The next prime is 31201144427. The reversal of 31201144420 is 2444110213.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 23548743936 + 7652400484 = 153456^2 + 87478^2 .

It is a super-2 number, since 2×31201144420² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31201144391 and 31201144400.

It is not an unprimeable number, because it can be changed into a prime (31201144427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780028591 + ... + 780028630.

It is an arithmetic number, because the mean of its divisors is an integer number (5460200277).

Almost surely, 2^31201144420 is an apocalyptic number.

It is an amenable number.

31201144420 is an abundant number, since it is smaller than the sum of its proper divisors (34321258904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31201144420 is a wasteful number, since it uses less digits than its factorization.

31201144420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560057230 (or 1560057228 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 31201144420 its reverse (2444110213), we get a palindrome (33645254633).

The spelling of 31201144420 in words is "thirty-one billion, two hundred one million, one hundred forty-four thousand, four hundred twenty".