71516891 has 2 divisors, whose sum is σ = 71516892. Its totient is φ = 71516890.

The previous prime is 71516881. The next prime is 71516897. The reversal of 71516891 is 19861517.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71516891 is a prime.

It is a super-2 number, since 2×71516891² = 10229331396611762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71516897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35758445 + 35758446.

It is an arithmetic number, because the mean of its divisors is an integer number (35758446).

Almost surely, 2^71516891 is an apocalyptic number.

71516891 is a deficient number, since it is larger than the sum of its proper divisors (1).

71516891 is an equidigital number, since it uses as much as digits as its factorization.

71516891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 38.

The square root of 71516891 is about 8456.7659894312. The cubic root of 71516891 is about 415.0842060706.

The spelling of 71516891 in words is "seventy-one million, five hundred sixteen thousand, eight hundred ninety-one".