51761569 has 4 divisors (see below), whose sum is σ = 54012096. Its totient is φ = 49511044.

The previous prime is 51761543. The next prime is 51761581. The reversal of 51761569 is 96516715.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51761569 is a prime.

It is a super-2 number, since 2×51761569² = 5358520050683522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51761519) 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, 1125229 + ... + 1125274.

It is an arithmetic number, because the mean of its divisors is an integer number (13503024).

Almost surely, 2^51761569 is an apocalyptic number.

It is an amenable number.

51761569 is a deficient number, since it is larger than the sum of its proper divisors (2250527).

51761569 is a wasteful number, since it uses less digits than its factorization.

51761569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2250526.

The product of its digits is 56700, while the sum is 40.

The square root of 51761569 is about 7194.5513411192. The cubic root of 51761569 is about 372.6797630916.

The spelling of 51761569 in words is "fifty-one million, seven hundred sixty-one thousand, five hundred sixty-nine".