123365201531 has 16 divisors (see below), whose sum is σ = 144943880928. Its totient is φ = 103515148800.

The previous prime is 123365201527. The next prime is 123365201567. The reversal of 123365201531 is 135102563321.

It is a cyclic number.

It is not a de Polignac number, because 123365201531 - 2² = 123365201527 is a prime.

It is a super-2 number, since 2×123365201531² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123365201431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2425421 + ... + 2475761.

It is an arithmetic number, because the mean of its divisors is an integer number (9058992558).

Almost surely, 2^123365201531 is an apocalyptic number.

123365201531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123365201531 is a deficient number, since it is larger than the sum of its proper divisors (21578679397).

123365201531 is a wasteful number, since it uses less digits than its factorization.

123365201531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67502.

The product of its (nonzero) digits is 16200, while the sum is 32.

Adding to 123365201531 its reverse (135102563321), we get a palindrome (258467764852).

The spelling of 123365201531 in words is "one hundred twenty-three billion, three hundred sixty-five million, two hundred one thousand, five hundred thirty-one".