71487971 has 2 divisors, whose sum is σ = 71487972. Its totient is φ = 71487970.

The previous prime is 71487961. The next prime is 71487989. The reversal of 71487971 is 17978417.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71487971 - 2²⁶ = 4379107 is a prime.

It is a super-2 number, since 2×71487971² = 10221059995393682, which contains 22 as substring.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (71487931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35743985 + 35743986.

It is an arithmetic number, because the mean of its divisors is an integer number (35743986).

Almost surely, 2^71487971 is an apocalyptic number.

71487971 is a deficient number, since it is larger than the sum of its proper divisors (1).

71487971 is an equidigital number, since it uses as much as digits as its factorization.

71487971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 44.

The square root of 71487971 is about 8455.0559430438. The cubic root of 71487971 is about 415.0282479441.

The spelling of 71487971 in words is "seventy-one million, four hundred eighty-seven thousand, nine hundred seventy-one".