81602431 has 8 divisors (see below), whose sum is σ = 86512320. Its totient is φ = 76704768.

The previous prime is 81602429. The next prime is 81602461. The reversal of 81602431 is 13420618.

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 81602431 - 2¹ = 81602429 is a prime.

It is a super-2 number, since 2×81602431² = 13317913490219522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81602396 and 81602405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81602401) 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, 13210 + ... + 18376.

It is an arithmetic number, because the mean of its divisors is an integer number (10814040).

Almost surely, 2^81602431 is an apocalyptic number.

81602431 is a deficient number, since it is larger than the sum of its proper divisors (4909889).

81602431 is a wasteful number, since it uses less digits than its factorization.

81602431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6113.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 81602431 is about 9033.4063896185. The cubic root of 81602431 is about 433.7448842922.

The spelling of 81602431 in words is "eighty-one million, six hundred two thousand, four hundred thirty-one".