123151491 has 12 divisors (see below), whose sum is σ = 179720632. Its totient is φ = 81254016.

The previous prime is 123151481. The next prime is 123151517. The reversal of 123151491 is 194151321.

It is a happy number.

123151491 is a `hidden beast` number, since 1 + 23 + 151 + 491 = 666.

It is not a de Polignac number, because 123151491 - 2¹¹ = 123149443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123151411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69661 + ... + 71406.

Almost surely, 2^123151491 is an apocalyptic number.

123151491 is a deficient number, since it is larger than the sum of its proper divisors (56569141).

123151491 is a wasteful number, since it uses less digits than its factorization.

123151491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141170 (or 141167 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 123151491 is about 11097.3641464989. The cubic root of 123151491 is about 497.5230712431.

The spelling of 123151491 in words is "one hundred twenty-three million, one hundred fifty-one thousand, four hundred ninety-one".