71531693 has 4 divisors (see below), whose sum is σ = 73465020. Its totient is φ = 69598368.

The previous prime is 71531687. The next prime is 71531723. The reversal of 71531693 is 39613517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39613517 = 419 ⋅94543.

It can be written as a sum of positive squares in 2 ways, for example, as 44262409 + 27269284 = 6653^2 + 5222^2 .

It is a cyclic number.

It is not a de Polignac number, because 71531693 - 2¹² = 71527597 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 (71531093) 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, 966608 + ... + 966681.

It is an arithmetic number, because the mean of its divisors is an integer number (18366255).

Almost surely, 2^71531693 is an apocalyptic number.

It is an amenable number.

71531693 is a deficient number, since it is larger than the sum of its proper divisors (1933327).

71531693 is a wasteful number, since it uses less digits than its factorization.

71531693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933326.

The product of its digits is 17010, while the sum is 35.

The square root of 71531693 is about 8457.6411013946. The cubic root of 71531693 is about 415.1128410429.

The spelling of 71531693 in words is "seventy-one million, five hundred thirty-one thousand, six hundred ninety-three".