81374807 has 2 divisors, whose sum is σ = 81374808. Its totient is φ = 81374806.

The previous prime is 81374773. The next prime is 81374809. The reversal of 81374807 is 70847318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81374807 - 2⁶ = 81374743 is a prime.

Together with 81374809, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81374809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40687403 + 40687404.

It is an arithmetic number, because the mean of its divisors is an integer number (40687404).

Almost surely, 2^81374807 is an apocalyptic number.

81374807 is a deficient number, since it is larger than the sum of its proper divisors (1).

81374807 is an equidigital number, since it uses as much as digits as its factorization.

81374807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 81374807 is about 9020.7985788399. The cubic root of 81374807 is about 433.3412088641.

The spelling of 81374807 in words is "eighty-one million, three hundred seventy-four thousand, eight hundred seven".