139184257 has 2 divisors, whose sum is σ = 139184258. Its totient is φ = 139184256.

The previous prime is 139184231. The next prime is 139184263. The reversal of 139184257 is 752481931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94012416 + 45171841 = 9696^2 + 6721^2 .

It is a cyclic number.

It is not a de Polignac number, because 139184257 - 2²⁷ = 4966529 is a prime.

It is not a weakly prime, because it can be changed into another prime (139184207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69592128 + 69592129.

It is an arithmetic number, because the mean of its divisors is an integer number (69592129).

Almost surely, 2^139184257 is an apocalyptic number.

It is an amenable number.

139184257 is a deficient number, since it is larger than the sum of its proper divisors (1).

139184257 is an equidigital number, since it uses as much as digits as its factorization.

139184257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 40.

The square root of 139184257 is about 11797.6377720288. The cubic root of 139184257 is about 518.2389353522.

The spelling of 139184257 in words is "one hundred thirty-nine million, one hundred eighty-four thousand, two hundred fifty-seven".