139790661 has 4 divisors (see below), whose sum is σ = 186387552. Its totient is φ = 93193772.

The previous prime is 139790659. The next prime is 139790663. The reversal of 139790661 is 166097931.

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, and also an emirpimes, since its reverse is a distinct semiprime: 166097931 = 3 ⋅55365977.

It is an interprime number because it is at equal distance from previous prime (139790659) and next prime (139790663).

It is a cyclic number.

It is not a de Polignac number, because 139790661 - 2¹ = 139790659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139790663) 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, 23298441 + ... + 23298446.

It is an arithmetic number, because the mean of its divisors is an integer number (46596888).

Almost surely, 2^139790661 is an apocalyptic number.

It is an amenable number.

139790661 is a deficient number, since it is larger than the sum of its proper divisors (46596891).

139790661 is an equidigital number, since it uses as much as digits as its factorization.

139790661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46596890.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 139790661 is about 11823.3100695194. The cubic root of 139790661 is about 518.9904735760.

The spelling of 139790661 in words is "one hundred thirty-nine million, seven hundred ninety thousand, six hundred sixty-one".