139968641 has 2 divisors, whose sum is σ = 139968642. Its totient is φ = 139968640.

The previous prime is 139968637. The next prime is 139968671. The reversal of 139968641 is 146869931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72318016 + 67650625 = 8504^2 + 8225^2 .

It is a cyclic number.

It is not a de Polignac number, because 139968641 - 2² = 139968637 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139968671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69984320 + 69984321.

It is an arithmetic number, because the mean of its divisors is an integer number (69984321).

Almost surely, 2^139968641 is an apocalyptic number.

It is an amenable number.

139968641 is a deficient number, since it is larger than the sum of its proper divisors (1).

139968641 is an equidigital number, since it uses as much as digits as its factorization.

139968641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 139968641 is about 11830.8343323706. The cubic root of 139968641 is about 519.2106379037.

The spelling of 139968641 in words is "one hundred thirty-nine million, nine hundred sixty-eight thousand, six hundred forty-one".