78524531 has 2 divisors, whose sum is σ = 78524532. Its totient is φ = 78524530.

The previous prime is 78524447. The next prime is 78524533. The reversal of 78524531 is 13542587.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78524531 is a prime.

It is a super-2 number, since 2×78524531² = 12332203937539922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 78524533, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78524491 and 78524500.

It is not a weakly prime, because it can be changed into another prime (78524533) 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, 39262265 + 39262266.

It is an arithmetic number, because the mean of its divisors is an integer number (39262266).

Almost surely, 2^78524531 is an apocalyptic number.

78524531 is a deficient number, since it is larger than the sum of its proper divisors (1).

78524531 is an equidigital number, since it uses as much as digits as its factorization.

78524531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33600, while the sum is 35.

The square root of 78524531 is about 8861.4068296180. The cubic root of 78524531 is about 428.2214822316.

The spelling of 78524531 in words is "seventy-eight million, five hundred twenty-four thousand, five hundred thirty-one".