74915981 has 4 divisors (see below), whose sum is σ = 85618272. Its totient is φ = 64213692.

The previous prime is 74915969. The next prime is 74915999. The reversal of 74915981 is 18951947.

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 a de Polignac number, because none of the positive numbers 2^k-74915981 is a prime.

It is a super-2 number, since 2×74915981² = 11224808418384722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74915921) 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, 5351135 + ... + 5351148.

It is an arithmetic number, because the mean of its divisors is an integer number (21404568).

Almost surely, 2^74915981 is an apocalyptic number.

It is an amenable number.

74915981 is a deficient number, since it is larger than the sum of its proper divisors (10702291).

74915981 is a wasteful number, since it uses less digits than its factorization.

74915981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10702290.

The product of its digits is 90720, while the sum is 44.

The square root of 74915981 is about 8655.4018393140. The cubic root of 74915981 is about 421.5587974340.

The spelling of 74915981 in words is "seventy-four million, nine hundred fifteen thousand, nine hundred eighty-one".