51531621001 has 16 divisors (see below), whose sum is σ = 62194908160. Its totient is φ = 41708889360.

The previous prime is 51531620989. The next prime is 51531621019. The reversal of 51531621001 is 10012613515.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51531621001 - 2¹¹ = 51531618953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51531621301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 590205 + ... + 671866.

It is an arithmetic number, because the mean of its divisors is an integer number (3887181760).

Almost surely, 2^51531621001 is an apocalyptic number.

It is an amenable number.

51531621001 is a deficient number, since it is larger than the sum of its proper divisors (10663287159).

51531621001 is a wasteful number, since it uses less digits than its factorization.

51531621001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262404.

The product of its (nonzero) digits is 900, while the sum is 25.

The spelling of 51531621001 in words is "fifty-one billion, five hundred thirty-one million, six hundred twenty-one thousand, one".