139431361 has 2 divisors, whose sum is σ = 139431362. Its totient is φ = 139431360.

The previous prime is 139431353. The next prime is 139431371. The reversal of 139431361 is 163134931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106998336 + 32433025 = 10344^2 + 5695^2 .

It is a cyclic number.

It is not a de Polignac number, because 139431361 - 2³ = 139431353 is a prime.

It is a super-2 number, since 2×139431361² = 38882208860624642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139431301) 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, 69715680 + 69715681.

It is an arithmetic number, because the mean of its divisors is an integer number (69715681).

Almost surely, 2^139431361 is an apocalyptic number.

It is an amenable number.

139431361 is a deficient number, since it is larger than the sum of its proper divisors (1).

139431361 is an equidigital number, since it uses as much as digits as its factorization.

139431361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 31.

The square root of 139431361 is about 11808.1057329277. The cubic root of 139431361 is about 518.5454432078.

The spelling of 139431361 in words is "one hundred thirty-nine million, four hundred thirty-one thousand, three hundred sixty-one".