51145017231 has 48 divisors (see below), whose sum is σ = 87380778240. Its totient is φ = 25850603520.

The previous prime is 51145017227. The next prime is 51145017257. The reversal of 51145017231 is 13271054115.

It is not a de Polignac number, because 51145017231 - 2² = 51145017227 is a prime.

It is a super-2 number, since 2×51145017231² (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 (51145017221) 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, 235375 + ... + 397103.

It is an arithmetic number, because the mean of its divisors is an integer number (1820432880).

Almost surely, 2^51145017231 is an apocalyptic number.

51145017231 is a deficient number, since it is larger than the sum of its proper divisors (36235761009).

51145017231 is a wasteful number, since it uses less digits than its factorization.

51145017231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161824 (or 161787 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 30.

The spelling of 51145017231 in words is "fifty-one billion, one hundred forty-five million, seventeen thousand, two hundred thirty-one".