71427997 has 2 divisors, whose sum is σ = 71427998. Its totient is φ = 71427996.

The previous prime is 71427989. The next prime is 71428003. The reversal of 71427997 is 79972417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70375321 + 1052676 = 8389^2 + 1026^2 .

It is a cyclic number.

It is not a de Polignac number, because 71427997 - 2³ = 71427989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71427947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35713998 + 35713999.

It is an arithmetic number, because the mean of its divisors is an integer number (35713999).

Almost surely, 2^71427997 is an apocalyptic number.

It is an amenable number.

71427997 is a deficient number, since it is larger than the sum of its proper divisors (1).

71427997 is an equidigital number, since it uses as much as digits as its factorization.

71427997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 222264, while the sum is 46.

The square root of 71427997 is about 8451.5085635643. The cubic root of 71427997 is about 414.9121544360.

The spelling of 71427997 in words is "seventy-one million, four hundred twenty-seven thousand, nine hundred ninety-seven".