77540531 has 2 divisors, whose sum is σ = 77540532. Its totient is φ = 77540530.

The previous prime is 77540513. The next prime is 77540599. The reversal of 77540531 is 13504577.

Together with previous prime (77540513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77540531 - 2⁶ = 77540467 is a prime.

It is a super-2 number, since 2×77540531² = 12025067895523922, 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 (77540731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38770265 + 38770266.

It is an arithmetic number, because the mean of its divisors is an integer number (38770266).

Almost surely, 2^77540531 is an apocalyptic number.

77540531 is a deficient number, since it is larger than the sum of its proper divisors (1).

77540531 is an equidigital number, since it uses as much as digits as its factorization.

77540531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14700, while the sum is 32.

The square root of 77540531 is about 8805.7101360424. The cubic root of 77540531 is about 426.4252606426.

The spelling of 77540531 in words is "seventy-seven million, five hundred forty thousand, five hundred thirty-one".