123149961 has 12 divisors (see below), whose sum is σ = 194054640. Its totient is φ = 74636280.

The previous prime is 123149947. The next prime is 123149987. The reversal of 123149961 is 169941321.

It is a happy number.

It is not a de Polignac number, because 123149961 - 2⁷ = 123149833 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (123149941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 621871 + ... + 622068.

It is an arithmetic number, because the mean of its divisors is an integer number (16171220).

Almost surely, 2^123149961 is an apocalyptic number.

123149961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123149961 is a deficient number, since it is larger than the sum of its proper divisors (70904679).

123149961 is a wasteful number, since it uses less digits than its factorization.

123149961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243956 (or 1243953 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 123149961 is about 11097.2952109962. The cubic root of 123149961 is about 497.5210108716.

The spelling of 123149961 in words is "one hundred twenty-three million, one hundred forty-nine thousand, nine hundred sixty-one".