71631589 has 4 divisors (see below), whose sum is σ = 71715456. Its totient is φ = 71547724.

The previous prime is 71631583. The next prime is 71631613. The reversal of 71631589 is 98513617.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71631589 - 2¹¹ = 71629541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71631583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40639 + ... + 42364.

It is an arithmetic number, because the mean of its divisors is an integer number (17928864).

Almost surely, 2^71631589 is an apocalyptic number.

It is an amenable number.

71631589 is a deficient number, since it is larger than the sum of its proper divisors (83867).

71631589 is an equidigital number, since it uses as much as digits as its factorization.

71631589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83866.

The product of its digits is 45360, while the sum is 40.

The square root of 71631589 is about 8463.5447065636. The cubic root of 71631589 is about 415.3059900365.

The spelling of 71631589 in words is "seventy-one million, six hundred thirty-one thousand, five hundred eighty-nine".