74789531 has 2 divisors, whose sum is σ = 74789532. Its totient is φ = 74789530.

The previous prime is 74789503. The next prime is 74789551. The reversal of 74789531 is 13598747.

It is a strong prime.

It is an emirp because it is prime and its reverse (13598747) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74789531 - 2⁶ = 74789467 is a prime.

It is a super-2 number, since 2×74789531² = 11186947894399922, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (74789551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37394765 + 37394766.

It is an arithmetic number, because the mean of its divisors is an integer number (37394766).

Almost surely, 2^74789531 is an apocalyptic number.

74789531 is a deficient number, since it is larger than the sum of its proper divisors (1).

74789531 is an equidigital number, since it uses as much as digits as its factorization.

74789531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 44.

The square root of 74789531 is about 8648.0940674810. The cubic root of 74789531 is about 421.3214821153.

The spelling of 74789531 in words is "seventy-four million, seven hundred eighty-nine thousand, five hundred thirty-one".