123731001 has 12 divisors (see below), whose sum is σ = 178848228. Its totient is φ = 82429344.

The previous prime is 123730987. The next prime is 123731051. The reversal of 123731001 is 100137321.

It can be written as a sum of positive squares in 2 ways, for example, as 44876601 + 78854400 = 6699^2 + 8880^2 .

It is not a de Polignac number, because 123731001 - 2¹⁵ = 123698233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123731051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11631 + ... + 19563.

It is an arithmetic number, because the mean of its divisors is an integer number (14904019).

Almost surely, 2^123731001 is an apocalyptic number.

It is an amenable number.

123731001 is a deficient number, since it is larger than the sum of its proper divisors (55117227).

123731001 is a wasteful number, since it uses less digits than its factorization.

123731001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9672 (or 9669 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 123731001 is about 11123.4437563194. The cubic root of 123731001 is about 498.3022431011.

Adding to 123731001 its reverse (100137321), we get a palindrome (223868322).

The spelling of 123731001 in words is "one hundred twenty-three million, seven hundred thirty-one thousand, one".