71516531 has 2 divisors, whose sum is σ = 71516532. Its totient is φ = 71516530.

The previous prime is 71516527. The next prime is 71516579. The reversal of 71516531 is 13561517.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71516531 - 2² = 71516527 is a prime.

It is a super-2 number, since 2×71516531² = 10229228412547922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71516494 and 71516503.

It is not a weakly prime, because it can be changed into another prime (71513531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35758265 + 35758266.

It is an arithmetic number, because the mean of its divisors is an integer number (35758266).

Almost surely, 2^71516531 is an apocalyptic number.

71516531 is a deficient number, since it is larger than the sum of its proper divisors (1).

71516531 is an equidigital number, since it uses as much as digits as its factorization.

71516531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3150, while the sum is 29.

The square root of 71516531 is about 8456.7447046721. The cubic root of 71516531 is about 415.0835095891.

The spelling of 71516531 in words is "seventy-one million, five hundred sixteen thousand, five hundred thirty-one".