51231622530 has 32 divisors (see below), whose sum is σ = 134133703488. Its totient is φ = 12419787200.

The previous prime is 51231622499. The next prime is 51231622531. The reversal of 51231622530 is 3522613215.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (51231622531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77623341 + ... + 77624000.

It is an arithmetic number, because the mean of its divisors is an integer number (4191678234).

Almost surely, 2^51231622530 is an apocalyptic number.

51231622530 is an abundant number, since it is smaller than the sum of its proper divisors (82902080958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51231622530 is a wasteful number, since it uses less digits than its factorization.

51231622530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155247362.

The product of its (nonzero) digits is 10800, while the sum is 30.

The spelling of 51231622530 in words is "fifty-one billion, two hundred thirty-one million, six hundred twenty-two thousand, five hundred thirty".