51520157 has 12 divisors (see below), whose sum is σ = 56744640. Its totient is φ = 46741968.

The previous prime is 51520151. The next prime is 51520159. The reversal of 51520157 is 75102515.

It is a happy number.

It is not a de Polignac number, because 51520157 - 2⁶ = 51520093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520151) 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 11 ways as a sum of consecutive naturals, for example, 7388 + ... + 12554.

It is an arithmetic number, because the mean of its divisors is an integer number (4728720).

Almost surely, 2^51520157 is an apocalyptic number.

It is an amenable number.

51520157 is a deficient number, since it is larger than the sum of its proper divisors (5224483).

51520157 is a wasteful number, since it uses less digits than its factorization.

51520157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5252 (or 5239 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 51520157 is about 7177.7543145471. The cubic root of 51520157 is about 372.0994767110.

The spelling of 51520157 in words is "fifty-one million, five hundred twenty thousand, one hundred fifty-seven".