51490231011 has 16 divisors (see below), whose sum is σ = 76508192800. Its totient is φ = 34224954624.

The previous prime is 51490230997. The next prime is 51490231027. The reversal of 51490231011 is 11013209415.

It is a happy number.

51490231011 is a `hidden beast` number, since 51 + 490 + 23 + 101 + 1 = 666.

It is not a de Polignac number, because 51490231011 - 2⁶ = 51490230947 is a prime.

It is a super-2 number, since 2×51490231011² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51490231511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2820346 + ... + 2838543.

It is an arithmetic number, because the mean of its divisors is an integer number (4781762050).

Almost surely, 2^51490231011 is an apocalyptic number.

51490231011 is a deficient number, since it is larger than the sum of its proper divisors (25017961789).

51490231011 is a wasteful number, since it uses less digits than its factorization.

51490231011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5659235 (or 5659229 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The spelling of 51490231011 in words is "fifty-one billion, four hundred ninety million, two hundred thirty-one thousand, eleven".