139681357 has 2 divisors, whose sum is σ = 139681358. Its totient is φ = 139681356.

The previous prime is 139681273. The next prime is 139681361. The reversal of 139681357 is 753186931.

139681357 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83521321 + 56160036 = 9139^2 + 7494^2 .

It is a cyclic number.

It is not a de Polignac number, because 139681357 - 2⁷ = 139681229 is a prime.

It is a super-2 number, since 2×139681357² = 39021762986722898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139681387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69840678 + 69840679.

It is an arithmetic number, because the mean of its divisors is an integer number (69840679).

Almost surely, 2^139681357 is an apocalyptic number.

It is an amenable number.

139681357 is a deficient number, since it is larger than the sum of its proper divisors (1).

139681357 is an equidigital number, since it uses as much as digits as its factorization.

139681357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 139681357 is about 11818.6867713803. The cubic root of 139681357 is about 518.8551700058.

The spelling of 139681357 in words is "one hundred thirty-nine million, six hundred eighty-one thousand, three hundred fifty-seven".