81532807 has 2 divisors, whose sum is σ = 81532808. Its totient is φ = 81532806.

The previous prime is 81532757. The next prime is 81532831. The reversal of 81532807 is 70823518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81532807 - 2⁷ = 81532679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81532837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40766403 + 40766404.

It is an arithmetic number, because the mean of its divisors is an integer number (40766404).

Almost surely, 2^81532807 is an apocalyptic number.

81532807 is a deficient number, since it is larger than the sum of its proper divisors (1).

81532807 is an equidigital number, since it uses as much as digits as its factorization.

81532807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 81532807 is about 9029.5518714940. The cubic root of 81532807 is about 433.6214907190.

The spelling of 81532807 in words is "eighty-one million, five hundred thirty-two thousand, eight hundred seven".