51121646 has 4 divisors (see below), whose sum is σ = 76682472. Its totient is φ = 25560822.

The previous prime is 51121613. The next prime is 51121649. The reversal of 51121646 is 64612115.

51121646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×51121646² = 5226845379498632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51121649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12780410 + ... + 12780413.

It is an arithmetic number, because the mean of its divisors is an integer number (19170618).

Almost surely, 2^51121646 is an apocalyptic number.

51121646 is a deficient number, since it is larger than the sum of its proper divisors (25560826).

51121646 is a wasteful number, since it uses less digits than its factorization.

51121646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25560825.

The product of its digits is 1440, while the sum is 26.

The square root of 51121646 is about 7149.9402794709. The cubic root of 51121646 is about 371.1375896409.

The spelling of 51121646 in words is "fifty-one million, one hundred twenty-one thousand, six hundred forty-six".