82151257 has 2 divisors, whose sum is σ = 82151258. Its totient is φ = 82151256.

The previous prime is 82151243. The next prime is 82151263. The reversal of 82151257 is 75215128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78074896 + 4076361 = 8836^2 + 2019^2 .

It is a cyclic number.

It is not a de Polignac number, because 82151257 - 2⁷ = 82151129 is a prime.

It is not a weakly prime, because it can be changed into another prime (82151227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41075628 + 41075629.

It is an arithmetic number, because the mean of its divisors is an integer number (41075629).

Almost surely, 2^82151257 is an apocalyptic number.

It is an amenable number.

82151257 is a deficient number, since it is larger than the sum of its proper divisors (1).

82151257 is an equidigital number, since it uses as much as digits as its factorization.

82151257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5600, while the sum is 31.

The square root of 82151257 is about 9063.7330609413. The cubic root of 82151257 is about 434.7151118292.

The spelling of 82151257 in words is "eighty-two million, one hundred fifty-one thousand, two hundred fifty-seven".