74731861 has 2 divisors, whose sum is σ = 74731862. Its totient is φ = 74731860.

The previous prime is 74731859. The next prime is 74731871. The reversal of 74731861 is 16813747.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49420900 + 25310961 = 7030^2 + 5031^2 .

It is a cyclic number.

It is not a de Polignac number, because 74731861 - 2¹ = 74731859 is a prime.

Together with 74731859, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 74731861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74731841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37365930 + 37365931.

It is an arithmetic number, because the mean of its divisors is an integer number (37365931).

Almost surely, 2^74731861 is an apocalyptic number.

It is an amenable number.

74731861 is a deficient number, since it is larger than the sum of its proper divisors (1).

74731861 is an equidigital number, since it uses as much as digits as its factorization.

74731861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 37.

The square root of 74731861 is about 8644.7591637940. The cubic root of 74731861 is about 421.2131609929.

The spelling of 74731861 in words is "seventy-four million, seven hundred thirty-one thousand, eight hundred sixty-one".