74312431 has 2 divisors, whose sum is σ = 74312432. Its totient is φ = 74312430.

The previous prime is 74312429. The next prime is 74312443. The reversal of 74312431 is 13421347.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 74312431 - 2¹ = 74312429 is a prime.

It is a super-2 number, since 2×74312431² = 11044674802259522, which contains 22 as substring.

Together with 74312429, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 74312396 and 74312405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74315431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37156215 + 37156216.

It is an arithmetic number, because the mean of its divisors is an integer number (37156216).

Almost surely, 2^74312431 is an apocalyptic number.

74312431 is a deficient number, since it is larger than the sum of its proper divisors (1).

74312431 is an equidigital number, since it uses as much as digits as its factorization.

74312431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 25.

The square root of 74312431 is about 8620.4658226803. The cubic root of 74312431 is about 420.4236673497.

Adding to 74312431 its reverse (13421347), we get a palindrome (87733778).

The spelling of 74312431 in words is "seventy-four million, three hundred twelve thousand, four hundred thirty-one".