76421531 has 2 divisors, whose sum is σ = 76421532. Its totient is φ = 76421530.

The previous prime is 76421507. The next prime is 76421557. The reversal of 76421531 is 13512467.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76421531 is a prime.

It is a super-2 number, since 2×76421531² = 11680500800767922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 76421494 and 76421503.

It is not a weakly prime, because it can be changed into another prime (76421131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38210765 + 38210766.

It is an arithmetic number, because the mean of its divisors is an integer number (38210766).

Almost surely, 2^76421531 is an apocalyptic number.

76421531 is a deficient number, since it is larger than the sum of its proper divisors (1).

76421531 is an equidigital number, since it uses as much as digits as its factorization.

76421531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 29.

The square root of 76421531 is about 8741.9409172105. The cubic root of 76421531 is about 424.3640426185.

Adding to 76421531 its reverse (13512467), we get a palindrome (89933998).

The spelling of 76421531 in words is "seventy-six million, four hundred twenty-one thousand, five hundred thirty-one".