139584257 has 2 divisors, whose sum is σ = 139584258. Its totient is φ = 139584256.

The previous prime is 139584253. The next prime is 139584259. The reversal of 139584257 is 752485931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99121936 + 40462321 = 9956^2 + 6361^2 .

It is an emirp because it is prime and its reverse (752485931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139584257 - 2² = 139584253 is a prime.

Together with 139584259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139584253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69792128 + 69792129.

It is an arithmetic number, because the mean of its divisors is an integer number (69792129).

Almost surely, 2^139584257 is an apocalyptic number.

It is an amenable number.

139584257 is a deficient number, since it is larger than the sum of its proper divisors (1).

139584257 is an equidigital number, since it uses as much as digits as its factorization.

139584257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 44.

The square root of 139584257 is about 11814.5781558209. The cubic root of 139584257 is about 518.7349141207.

The spelling of 139584257 in words is "one hundred thirty-nine million, five hundred eighty-four thousand, two hundred fifty-seven".