123631513 has 2 divisors, whose sum is σ = 123631514. Its totient is φ = 123631512.

The previous prime is 123631489. The next prime is 123631561. The reversal of 123631513 is 315136321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119836809 + 3794704 = 10947^2 + 1948^2 .

It is a cyclic number.

It is not a de Polignac number, because 123631513 - 2⁵ = 123631481 is a prime.

It is not a weakly prime, because it can be changed into another prime (123631213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61815756 + 61815757.

It is an arithmetic number, because the mean of its divisors is an integer number (61815757).

Almost surely, 2^123631513 is an apocalyptic number.

It is an amenable number.

123631513 is a deficient number, since it is larger than the sum of its proper divisors (1).

123631513 is an equidigital number, since it uses as much as digits as its factorization.

123631513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 25.

The square root of 123631513 is about 11118.9708606507. The cubic root of 123631513 is about 498.1686511791.

Adding to 123631513 its reverse (315136321), we get a palindrome (438767834).

The spelling of 123631513 in words is "one hundred twenty-three million, six hundred thirty-one thousand, five hundred thirteen".