51356487 has 32 divisors (see below), whose sum is σ = 88721920. Its totient is φ = 25660800.

The previous prime is 51356479. The next prime is 51356489. The reversal of 51356487 is 78465315.

It is not a de Polignac number, because 51356487 - 2³ = 51356479 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51356489) 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, 237 + ... + 10137.

It is an arithmetic number, because the mean of its divisors is an integer number (2772560).

Almost surely, 2^51356487 is an apocalyptic number.

51356487 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

51356487 is a deficient number, since it is larger than the sum of its proper divisors (37365433).

51356487 is a wasteful number, since it uses less digits than its factorization.

51356487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9943.

The product of its digits is 100800, while the sum is 39.

The square root of 51356487 is about 7166.3440470019. The cubic root of 51356487 is about 371.7050283376.

The spelling of 51356487 in words is "fifty-one million, three hundred fifty-six thousand, four hundred eighty-seven".