71631657 has 6 divisors (see below), whose sum is σ = 103467962. Its totient is φ = 47754432.

The previous prime is 71631647. The next prime is 71631661. The reversal of 71631657 is 75613617.

It can be written as a sum of positive squares in only one way, i.e., 65755881 + 5875776 = 8109^2 + 2424^2 .

It is not a de Polignac number, because 71631657 - 2⁷ = 71631529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71631647) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3979528 + ... + 3979545.

Almost surely, 2^71631657 is an apocalyptic number.

It is an amenable number.

71631657 is a deficient number, since it is larger than the sum of its proper divisors (31836305).

71631657 is a wasteful number, since it uses less digits than its factorization.

71631657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7959079 (or 7959076 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 71631657 is about 8463.5487237919. The cubic root of 71631657 is about 415.3061214534.

The spelling of 71631657 in words is "seventy-one million, six hundred thirty-one thousand, six hundred fifty-seven".