51499157 has 8 divisors (see below), whose sum is σ = 54575640. Its totient is φ = 48509440.

The previous prime is 51499127. The next prime is 51499163. The reversal of 51499157 is 75199415.

It can be written as a sum of positive squares in 4 ways, for example, as 11062276 + 40436881 = 3326^2 + 6359^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51499157 - 2¹⁴ = 51482773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51499127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20468 + ... + 22845.

It is an arithmetic number, because the mean of its divisors is an integer number (6821955).

Almost surely, 2^51499157 is an apocalyptic number.

It is an amenable number.

51499157 is a deficient number, since it is larger than the sum of its proper divisors (3076483).

51499157 is a wasteful number, since it uses less digits than its factorization.

51499157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43383.

The product of its digits is 56700, while the sum is 41.

The square root of 51499157 is about 7176.2913123702. The cubic root of 51499157 is about 372.0489130002.

The spelling of 51499157 in words is "fifty-one million, four hundred ninety-nine thousand, one hundred fifty-seven".