82157461 has 2 divisors, whose sum is σ = 82157462. Its totient is φ = 82157460.

The previous prime is 82157419. The next prime is 82157483. The reversal of 82157461 is 16475128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66994225 + 15163236 = 8185^2 + 3894^2 .

It is a cyclic number.

It is not a de Polignac number, because 82157461 - 2²³ = 73768853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82157401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41078730 + 41078731.

It is an arithmetic number, because the mean of its divisors is an integer number (41078731).

Almost surely, 2^82157461 is an apocalyptic number.

It is an amenable number.

82157461 is a deficient number, since it is larger than the sum of its proper divisors (1).

82157461 is an equidigital number, since it uses as much as digits as its factorization.

82157461 is an evil number, because the sum of its binary digits is even.

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

The square root of 82157461 is about 9064.0752975690. The cubic root of 82157461 is about 434.7260546712.

The spelling of 82157461 in words is "eighty-two million, one hundred fifty-seven thousand, four hundred sixty-one".