82401531 has 4 divisors (see below), whose sum is σ = 109868712. Its totient is φ = 54934352.

The previous prime is 82401511. The next prime is 82401547. The reversal of 82401531 is 13510428.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 82401531 - 2¹¹ = 82399483 is a prime.

It is a super-2 number, since 2×82401531² = 13580024622287922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82401511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13733586 + ... + 13733591.

It is an arithmetic number, because the mean of its divisors is an integer number (27467178).

Almost surely, 2^82401531 is an apocalyptic number.

82401531 is a deficient number, since it is larger than the sum of its proper divisors (27467181).

82401531 is a wasteful number, since it uses less digits than its factorization.

82401531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27467180.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 82401531 is about 9077.5289038372. The cubic root of 82401531 is about 435.1561178310.

Adding to 82401531 its reverse (13510428), we get a palindrome (95911959).

The spelling of 82401531 in words is "eighty-two million, four hundred one thousand, five hundred thirty-one".