51531024436 has 6 divisors (see below), whose sum is σ = 90179292770. Its totient is φ = 25765512216.

The previous prime is 51531024409. The next prime is 51531024437. The reversal of 51531024436 is 63442013515.

It can be written as a sum of positive squares in only one way, i.e., 42836580900 + 8694443536 = 206970^2 + 93244^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51531024437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6441378051 + ... + 6441378058.

Almost surely, 2^51531024436 is an apocalyptic number.

It is an amenable number.

51531024436 is a deficient number, since it is larger than the sum of its proper divisors (38648268334).

51531024436 is a wasteful number, since it uses less digits than its factorization.

51531024436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12882756113 (or 12882756111 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 51531024436 in words is "fifty-one billion, five hundred thirty-one million, twenty-four thousand, four hundred thirty-six".