139794691 has 2 divisors, whose sum is σ = 139794692. Its totient is φ = 139794690.

The previous prime is 139794679. The next prime is 139794709. The reversal of 139794691 is 196497931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139794691 - 2⁷ = 139794563 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139794601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69897345 + 69897346.

It is an arithmetic number, because the mean of its divisors is an integer number (69897346).

Almost surely, 2^139794691 is an apocalyptic number.

139794691 is a deficient number, since it is larger than the sum of its proper divisors (1).

139794691 is an equidigital number, since it uses as much as digits as its factorization.

139794691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 49.

The square root of 139794691 is about 11823.4804943384. The cubic root of 139794691 is about 518.9954608226.

The spelling of 139794691 in words is "one hundred thirty-nine million, seven hundred ninety-four thousand, six hundred ninety-one".