81314657 has 2 divisors, whose sum is σ = 81314658. Its totient is φ = 81314656.

The previous prime is 81314599. The next prime is 81314659. The reversal of 81314657 is 75641318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78783376 + 2531281 = 8876^2 + 1591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81314657 is a prime.

It is a super-2 number, since 2×81314657² = 13224146886055298, which contains 22 as substring.

Together with 81314659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81314659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40657328 + 40657329.

It is an arithmetic number, because the mean of its divisors is an integer number (40657329).

Almost surely, 2^81314657 is an apocalyptic number.

It is an amenable number.

81314657 is a deficient number, since it is larger than the sum of its proper divisors (1).

81314657 is an equidigital number, since it uses as much as digits as its factorization.

81314657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 35.

The square root of 81314657 is about 9017.4640004826. The cubic root of 81314657 is about 433.2344112789.

The spelling of 81314657 in words is "eighty-one million, three hundred fourteen thousand, six hundred fifty-seven".