139733661 has 4 divisors (see below), whose sum is σ = 186311552. Its totient is φ = 93155772.

The previous prime is 139733651. The next prime is 139733669. The reversal of 139733661 is 166337931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 139733661 - 2⁶ = 139733597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139733669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23288941 + ... + 23288946.

It is an arithmetic number, because the mean of its divisors is an integer number (46577888).

Almost surely, 2^139733661 is an apocalyptic number.

It is an amenable number.

139733661 is a deficient number, since it is larger than the sum of its proper divisors (46577891).

139733661 is an equidigital number, since it uses as much as digits as its factorization.

139733661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46577890.

The product of its digits is 61236, while the sum is 39.

The square root of 139733661 is about 11820.8993312692. The cubic root of 139733661 is about 518.9199240880.

The spelling of 139733661 in words is "one hundred thirty-nine million, seven hundred thirty-three thousand, six hundred sixty-one".