82574981 has 2 divisors, whose sum is σ = 82574982. Its totient is φ = 82574980.

The previous prime is 82574971. The next prime is 82574983. The reversal of 82574981 is 18947528.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60202081 + 22372900 = 7759^2 + 4730^2 .

It is a cyclic number.

It is not a de Polignac number, because 82574981 - 2²² = 78380677 is a prime.

It is a super-2 number, since 2×82574981² = 13637254974300722, which contains 22 as substring.

Together with 82574983, 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 (82574983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41287490 + 41287491.

It is an arithmetic number, because the mean of its divisors is an integer number (41287491).

Almost surely, 2^82574981 is an apocalyptic number.

It is an amenable number.

82574981 is a deficient number, since it is larger than the sum of its proper divisors (1).

82574981 is an equidigital number, since it uses as much as digits as its factorization.

82574981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 44.

The square root of 82574981 is about 9087.0776930760. The cubic root of 82574981 is about 435.4612292000.

The spelling of 82574981 in words is "eighty-two million, five hundred seventy-four thousand, nine hundred eighty-one".