82978501 has 2 divisors, whose sum is σ = 82978502. Its totient is φ = 82978500.

The previous prime is 82978477. The next prime is 82978517. The reversal of 82978501 is 10587928.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81540900 + 1437601 = 9030^2 + 1199^2 .

It is a cyclic number.

It is not a de Polignac number, because 82978501 - 2⁷ = 82978373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82978001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41489250 + 41489251.

It is an arithmetic number, because the mean of its divisors is an integer number (41489251).

Almost surely, 2^82978501 is an apocalyptic number.

It is an amenable number.

82978501 is a deficient number, since it is larger than the sum of its proper divisors (1).

82978501 is an equidigital number, since it uses as much as digits as its factorization.

82978501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 82978501 is about 9109.2535918153. The cubic root of 82978501 is about 436.1694011794.

The spelling of 82978501 in words is "eighty-two million, nine hundred seventy-eight thousand, five hundred one".