123551001 has 40 divisors (see below), whose sum is σ = 215283200. Its totient is φ = 70584696.

The previous prime is 123550979. The next prime is 123551017. The reversal of 123551001 is 100155321.

It is not a de Polignac number, because 123551001 - 2⁵ = 123550969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123551201) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 25560 + ... + 30006.

It is an arithmetic number, because the mean of its divisors is an integer number (5382080).

Almost surely, 2^123551001 is an apocalyptic number.

It is an amenable number.

123551001 is a deficient number, since it is larger than the sum of its proper divisors (91732199).

123551001 is an frugal number, since it uses more digits than its factorization.

123551001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4480 (or 4457 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 123551001 is about 11115.3497920668. The cubic root of 123551001 is about 498.0604876448.

The spelling of 123551001 in words is "one hundred twenty-three million, five hundred fifty-one thousand, one".