71536531 has 12 divisors (see below), whose sum is σ = 78925392. Its totient is φ = 64790000.

The previous prime is 71536523. The next prime is 71536541. The reversal of 71536531 is 13563517.

It is not a de Polignac number, because 71536531 - 2³ = 71536523 is a prime.

It is a super-2 number, since 2×71536531² = 10234950535027922, 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 = 71536493 and 71536502.

It is not an unprimeable number, because it can be changed into a prime (71536511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36681 + ... + 38581.

It is an arithmetic number, because the mean of its divisors is an integer number (6577116).

Almost surely, 2^71536531 is an apocalyptic number.

71536531 is the 3783-rd centered decagonal number.

71536531 is a deficient number, since it is larger than the sum of its proper divisors (7388861).

71536531 is a wasteful number, since it uses less digits than its factorization.

71536531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2234 (or 2223 counting only the distinct ones).

The product of its digits is 9450, while the sum is 31.

The square root of 71536531 is about 8457.9271101139. The cubic root of 71536531 is about 415.1221994619.

The spelling of 71536531 in words is "seventy-one million, five hundred thirty-six thousand, five hundred thirty-one".