61501872531 has 64 divisors (see below), whose sum is σ = 91865958912. Its totient is φ = 36288000000.

The previous prime is 61501872473. The next prime is 61501872569. The reversal of 61501872531 is 13527810516.

It is not a de Polignac number, because 61501872531 - 2¹⁰ = 61501871507 is a prime.

It is a super-2 number, since 2×61501872531² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61501872531.

It is not an unprimeable number, because it can be changed into a prime (61501872571) 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 63 ways as a sum of consecutive naturals, for example, 58516956 + ... + 58518006.

It is an arithmetic number, because the mean of its divisors is an integer number (1435405608).

Almost surely, 2^61501872531 is an apocalyptic number.

61501872531 is a deficient number, since it is larger than the sum of its proper divisors (30364086381).

61501872531 is a wasteful number, since it uses less digits than its factorization.

61501872531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444.

The product of its (nonzero) digits is 50400, while the sum is 39.

The spelling of 61501872531 in words is "sixty-one billion, five hundred one million, eight hundred seventy-two thousand, five hundred thirty-one".