860642531 has 4 divisors (see below), whose sum is σ = 983591472. Its totient is φ = 737693592.

The previous prime is 860642507. The next prime is 860642539. The reversal of 860642531 is 135246068.

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 860642531 - 2⁶ = 860642467 is a prime.

It is a super-2 number, since 2×860642531² = 1481411132332171922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 860642491 and 860642500.

It is not an unprimeable number, because it can be changed into a prime (860642539) 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, 61474460 + ... + 61474473.

It is an arithmetic number, because the mean of its divisors is an integer number (245897868).

Almost surely, 2^860642531 is an apocalyptic number.

860642531 is a deficient number, since it is larger than the sum of its proper divisors (122948941).

860642531 is a wasteful number, since it uses less digits than its factorization.

860642531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122948940.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 860642531 is about 29336.7096144063. The cubic root of 860642531 is about 951.2053144295.

Adding to 860642531 its reverse (135246068), we get a palindrome (995888599).

The spelling of 860642531 in words is "eight hundred sixty million, six hundred forty-two thousand, five hundred thirty-one".