81488690831 has 8 divisors (see below), whose sum is σ = 81702020400. Its totient is φ = 81275451840.

The previous prime is 81488690827. The next prime is 81488690837. The reversal of 81488690831 is 13809688418.

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 81488690831 - 2² = 81488690827 is a prime.

It is a super-2 number, since 2×81488690831² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81488690837) 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, 2016755 + ... + 2056763.

It is an arithmetic number, because the mean of its divisors is an integer number (10212752550).

Almost surely, 2^81488690831 is an apocalyptic number.

81488690831 is a deficient number, since it is larger than the sum of its proper divisors (213329569).

81488690831 is a wasteful number, since it uses less digits than its factorization.

81488690831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45289.

The product of its (nonzero) digits is 2654208, while the sum is 56.

The spelling of 81488690831 in words is "eighty-one billion, four hundred eighty-eight million, six hundred ninety thousand, eight hundred thirty-one".