139643659 has 2 divisors, whose sum is σ = 139643660. Its totient is φ = 139643658.

The previous prime is 139643633. The next prime is 139643677. The reversal of 139643659 is 956346931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139643659 - 2¹⁷ = 139512587 is a prime.

It is not a weakly prime, because it can be changed into another prime (139643359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69821829 + 69821830.

It is an arithmetic number, because the mean of its divisors is an integer number (69821830).

Almost surely, 2^139643659 is an apocalyptic number.

139643659 is a deficient number, since it is larger than the sum of its proper divisors (1).

139643659 is an equidigital number, since it uses as much as digits as its factorization.

139643659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 46.

The square root of 139643659 is about 11817.0918165173. The cubic root of 139643659 is about 518.8084886101.

The spelling of 139643659 in words is "one hundred thirty-nine million, six hundred forty-three thousand, six hundred fifty-nine".