74918621 has 2 divisors, whose sum is σ = 74918622. Its totient is φ = 74918620.

The previous prime is 74918617. The next prime is 74918639. The reversal of 74918621 is 12681947.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51984100 + 22934521 = 7210^2 + 4789^2 .

It is a cyclic number.

It is not a de Polignac number, because 74918621 - 2² = 74918617 is a prime.

It is a super-2 number, since 2×74918621² = 11225599545083282, which contains 22 as substring.

It is equal to p_4389824 and since 74918621 and 4389824 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74918321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37459310 + 37459311.

It is an arithmetic number, because the mean of its divisors is an integer number (37459311).

Almost surely, 2^74918621 is an apocalyptic number.

It is an amenable number.

74918621 is a deficient number, since it is larger than the sum of its proper divisors (1).

74918621 is an equidigital number, since it uses as much as digits as its factorization.

74918621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 38.

The square root of 74918621 is about 8655.5543438881. The cubic root of 74918621 is about 421.5637492130.

The spelling of 74918621 in words is "seventy-four million, nine hundred eighteen thousand, six hundred twenty-one".