123157111 has 32 divisors (see below), whose sum is σ = 161491968. Its totient is φ = 91069440.

The previous prime is 123157093. The next prime is 123157207. The reversal of 123157111 is 111751321.

It is not a de Polignac number, because 123157111 - 2¹³ = 123148919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123157211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 348711 + ... + 349063.

It is an arithmetic number, because the mean of its divisors is an integer number (5046624).

Almost surely, 2^123157111 is an apocalyptic number.

123157111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123157111 is a deficient number, since it is larger than the sum of its proper divisors (38334857).

123157111 is a wasteful number, since it uses less digits than its factorization.

123157111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591.

The product of its digits is 210, while the sum is 22.

The square root of 123157111 is about 11097.6173568924. The cubic root of 123157111 is about 497.5306392584.

The spelling of 123157111 in words is "one hundred twenty-three million, one hundred fifty-seven thousand, one hundred eleven".