51881655 has 32 divisors (see below), whose sum is σ = 96897024. Its totient is φ = 23210496.

The previous prime is 51881653. The next prime is 51881657. The reversal of 51881655 is 55618815.

It is an interprime number because it is at equal distance from previous prime (51881653) and next prime (51881657).

It is not a de Polignac number, because 51881655 - 2¹ = 51881653 is a prime.

It is a super-2 number, since 2×51881655² = 5383412251078050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51881653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 322 + ... + 10191.

It is an arithmetic number, because the mean of its divisors is an integer number (3028032).

Almost surely, 2^51881655 is an apocalyptic number.

51881655 is a deficient number, since it is larger than the sum of its proper divisors (45015369).

51881655 is a wasteful number, since it uses less digits than its factorization.

51881655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10575.

The product of its digits is 48000, while the sum is 39.

The square root of 51881655 is about 7202.8921274721. The cubic root of 51881655 is about 372.9677441698.

The spelling of 51881655 in words is "fifty-one million, eight hundred eighty-one thousand, six hundred fifty-five".