139912991 has 8 divisors (see below), whose sum is σ = 140950368. Its totient is φ = 138880000.

The previous prime is 139912973. The next prime is 139912999. The reversal of 139912991 is 199219931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139912991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139912999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86591 + ... + 88191.

It is an arithmetic number, because the mean of its divisors is an integer number (17618796).

Almost surely, 2^139912991 is an apocalyptic number.

139912991 is a deficient number, since it is larger than the sum of its proper divisors (1037377).

139912991 is a wasteful number, since it uses less digits than its factorization.

139912991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193.

The product of its digits is 39366, while the sum is 44.

The square root of 139912991 is about 11828.4821934177. The cubic root of 139912991 is about 519.1418179596.

The spelling of 139912991 in words is "one hundred thirty-nine million, nine hundred twelve thousand, nine hundred ninety-one".