123163491 has 32 divisors (see below), whose sum is σ = 193708800. Its totient is φ = 68791680.

The previous prime is 123163471. The next prime is 123163499. The reversal of 123163491 is 194361321.

It is not a de Polignac number, because 123163491 - 2⁶ = 123163427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123163499) 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, 20545 + ... + 25853.

It is an arithmetic number, because the mean of its divisors is an integer number (6053400).

Almost surely, 2^123163491 is an apocalyptic number.

123163491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123163491 is a deficient number, since it is larger than the sum of its proper divisors (70545309).

123163491 is a wasteful number, since it uses less digits than its factorization.

123163491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5379.

The product of its digits is 3888, while the sum is 30.

The square root of 123163491 is about 11097.9048022588. The cubic root of 123163491 is about 497.5392304274.

The spelling of 123163491 in words is "one hundred twenty-three million, one hundred sixty-three thousand, four hundred ninety-one".