79780531 has 2 divisors, whose sum is σ = 79780532. Its totient is φ = 79780530.

The previous prime is 79780501. The next prime is 79780549. The reversal of 79780531 is 13508797.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79780531 - 2¹¹ = 79778483 is a prime.

It is a super-2 number, since 2×79780531² = 12729866253283922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79780501) 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, 39890265 + 39890266.

It is an arithmetic number, because the mean of its divisors is an integer number (39890266).

Almost surely, 2^79780531 is an apocalyptic number.

79780531 is a deficient number, since it is larger than the sum of its proper divisors (1).

79780531 is an equidigital number, since it uses as much as digits as its factorization.

79780531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 79780531 is about 8931.9947939976. The cubic root of 79780531 is about 430.4925507813.

The spelling of 79780531 in words is "seventy-nine million, seven hundred eighty thousand, five hundred thirty-one".