51477969 has 4 divisors (see below), whose sum is σ = 68637296. Its totient is φ = 34318644.

The previous prime is 51477953. The next prime is 51477977. The reversal of 51477969 is 96977415.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51477969 - 2⁴ = 51477953 is a prime.

It is a super-2 number, since 2×51477969² = 5299962584729922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51477169) 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, 8579659 + ... + 8579664.

It is an arithmetic number, because the mean of its divisors is an integer number (17159324).

Almost surely, 2^51477969 is an apocalyptic number.

It is an amenable number.

51477969 is a deficient number, since it is larger than the sum of its proper divisors (17159327).

51477969 is a wasteful number, since it uses less digits than its factorization.

51477969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17159326.

The product of its digits is 476280, while the sum is 48.

The square root of 51477969 is about 7174.8149105047. The cubic root of 51477969 is about 371.9978826912.

The spelling of 51477969 in words is "fifty-one million, four hundred seventy-seven thousand, nine hundred sixty-nine".