51091312525 has 48 divisors (see below), whose sum is σ = 74104899840. Its totient is φ = 34528665600.

The previous prime is 51091312511. The next prime is 51091312529. The reversal of 51091312525 is 52521319015.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-51091312525 is a prime.

It is a super-2 number, since 2×51091312525² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51091312529) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 300157 + ... + 438493.

It is an arithmetic number, because the mean of its divisors is an integer number (1543852080).

Almost surely, 2^51091312525 is an apocalyptic number.

51091312525 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51091312525 is a deficient number, since it is larger than the sum of its proper divisors (23013587315).

51091312525 is a wasteful number, since it uses less digits than its factorization.

51091312525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138454 (or 138449 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 34.

The spelling of 51091312525 in words is "fifty-one billion, ninety-one million, three hundred twelve thousand, five hundred twenty-five".