123151391 has 8 divisors (see below), whose sum is σ = 134936400. Its totient is φ = 111464640.

The previous prime is 123151381. The next prime is 123151403. The reversal of 123151391 is 193151321.

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 123151391 - 2²² = 118957087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123151391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123151351) 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, 21926 + ... + 26963.

It is an arithmetic number, because the mean of its divisors is an integer number (16867050).

Almost surely, 2^123151391 is an apocalyptic number.

123151391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123151391 is a deficient number, since it is larger than the sum of its proper divisors (11785009).

123151391 is a wasteful number, since it uses less digits than its factorization.

123151391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49129.

The product of its digits is 810, while the sum is 26.

The square root of 123151391 is about 11097.3596409236. The cubic root of 123151391 is about 497.5229365788.

The spelling of 123151391 in words is "one hundred twenty-three million, one hundred fifty-one thousand, three hundred ninety-one".