71612981 has 8 divisors (see below), whose sum is σ = 79065504. Its totient is φ = 64317520.

The previous prime is 71612971. The next prime is 71612999. The reversal of 71612981 is 18921617.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71612981 - 2⁶ = 71612917 is a prime.

It is a super-2 number, since 2×71612981² = 10256838095412722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71612941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38306 + ... + 40131.

It is an arithmetic number, because the mean of its divisors is an integer number (9883188).

Almost surely, 2^71612981 is an apocalyptic number.

It is an amenable number.

71612981 is a deficient number, since it is larger than the sum of its proper divisors (7452523).

71612981 is a wasteful number, since it uses less digits than its factorization.

71612981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78531.

The product of its digits is 6048, while the sum is 35.

The square root of 71612981 is about 8462.4453321720. The cubic root of 71612981 is about 415.2700250698.

The spelling of 71612981 in words is "seventy-one million, six hundred twelve thousand, nine hundred eighty-one".