81624026131 has 8 divisors (see below), whose sum is σ = 84260718464. Its totient is φ = 78987562560.

The previous prime is 81624026059. The next prime is 81624026161. The reversal of 81624026131 is 13162042618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81624026131 - 2¹³ = 81624017939 is a prime.

It is a super-2 number, since 2×81624026131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81624026161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 949471 + ... + 1031863.

It is an arithmetic number, because the mean of its divisors is an integer number (10532589808).

Almost surely, 2^81624026131 is an apocalyptic number.

81624026131 is a deficient number, since it is larger than the sum of its proper divisors (2636692333).

81624026131 is a wasteful number, since it uses less digits than its factorization.

81624026131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114381.

The product of its (nonzero) digits is 13824, while the sum is 34.

Adding to 81624026131 its reverse (13162042618), we get a palindrome (94786068749).

The spelling of 81624026131 in words is "eighty-one billion, six hundred twenty-four million, twenty-six thousand, one hundred thirty-one".