139761691 has 8 divisors (see below), whose sum is σ = 146594880. Its totient is φ = 133089408.

The previous prime is 139761659. The next prime is 139761697. The reversal of 139761691 is 196167931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139761691 - 2⁵ = 139761659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139761697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38446 + ... + 41923.

It is an arithmetic number, because the mean of its divisors is an integer number (18324360).

Almost surely, 2^139761691 is an apocalyptic number.

139761691 is a deficient number, since it is larger than the sum of its proper divisors (6833189).

139761691 is an equidigital number, since it uses as much as digits as its factorization.

139761691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80453.

The product of its digits is 61236, while the sum is 43.

The square root of 139761691 is about 11822.0848838096. The cubic root of 139761691 is about 518.9546195052.

The spelling of 139761691 in words is "one hundred thirty-nine million, seven hundred sixty-one thousand, six hundred ninety-one".