74643131 has 2 divisors, whose sum is σ = 74643132. Its totient is φ = 74643130.

The previous prime is 74643089. The next prime is 74643137. The reversal of 74643131 is 13134647.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 74643131 - 2⁶ = 74643067 is a prime.

It is a super-2 number, since 2×74643131² = 11143194010966322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 74643094 and 74643103.

It is not a weakly prime, because it can be changed into another prime (74643137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37321565 + 37321566.

It is an arithmetic number, because the mean of its divisors is an integer number (37321566).

Almost surely, 2^74643131 is an apocalyptic number.

74643131 is a deficient number, since it is larger than the sum of its proper divisors (1).

74643131 is an equidigital number, since it uses as much as digits as its factorization.

74643131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 29.

The square root of 74643131 is about 8639.6256284633. The cubic root of 74643131 is about 421.0463912258.

Adding to 74643131 its reverse (13134647), we get a palindrome (87777778).

The spelling of 74643131 in words is "seventy-four million, six hundred forty-three thousand, one hundred thirty-one".