83709257 has 2 divisors, whose sum is σ = 83709258. Its totient is φ = 83709256.

The previous prime is 83709191. The next prime is 83709277. The reversal of 83709257 is 75290738.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44408896 + 39300361 = 6664^2 + 6269^2 .

It is a cyclic number.

It is not a de Polignac number, because 83709257 - 2⁸ = 83709001 is a prime.

It is not a weakly prime, because it can be changed into another prime (83709277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41854628 + 41854629.

It is an arithmetic number, because the mean of its divisors is an integer number (41854629).

Almost surely, 2^83709257 is an apocalyptic number.

It is an amenable number.

83709257 is a deficient number, since it is larger than the sum of its proper divisors (1).

83709257 is an equidigital number, since it uses as much as digits as its factorization.

83709257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 83709257 is about 9149.2763101789. The cubic root of 83709257 is about 437.4460463534.

The spelling of 83709257 in words is "eighty-three million, seven hundred nine thousand, two hundred fifty-seven".