74101981 has 2 divisors, whose sum is σ = 74101982. Its totient is φ = 74101980.

The previous prime is 74101967. The next prime is 74101987. The reversal of 74101981 is 18910147.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69039481 + 5062500 = 8309^2 + 2250^2 .

It is a cyclic number.

It is not a de Polignac number, because 74101981 - 2⁵ = 74101949 is a prime.

It is a super-2 number, since 2×74101981² = 10982207176248722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74101987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37050990 + 37050991.

It is an arithmetic number, because the mean of its divisors is an integer number (37050991).

Almost surely, 2^74101981 is an apocalyptic number.

It is an amenable number.

74101981 is a deficient number, since it is larger than the sum of its proper divisors (1).

74101981 is an equidigital number, since it uses as much as digits as its factorization.

74101981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 74101981 is about 8608.2507514593. The cubic root of 74101981 is about 420.0264174615.

The spelling of 74101981 in words is "seventy-four million, one hundred one thousand, nine hundred eighty-one".