71406631 has 2 divisors, whose sum is σ = 71406632. Its totient is φ = 71406630.

The previous prime is 71406589. The next prime is 71406637. The reversal of 71406631 is 13660417.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71406631 is a prime.

It is a super-2 number, since 2×71406631² = 10197813901540322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71406631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71406637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35703315 + 35703316.

It is an arithmetic number, because the mean of its divisors is an integer number (35703316).

Almost surely, 2^71406631 is an apocalyptic number.

71406631 is a deficient number, since it is larger than the sum of its proper divisors (1).

71406631 is an equidigital number, since it uses as much as digits as its factorization.

71406631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 71406631 is about 8450.2444343344. The cubic root of 71406631 is about 414.8707799165.

The spelling of 71406631 in words is "seventy-one million, four hundred six thousand, six hundred thirty-one".