123531020761 has 16 divisors (see below), whose sum is σ = 133638018048. Its totient is φ = 113759596800.

The previous prime is 123531020719. The next prime is 123531020773. The reversal of 123531020761 is 167020135321.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 123531020761 - 2¹³ = 123531012569 is a prime.

It is a super-2 number, since 2×123531020761² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123531020161) 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, 113775 + ... + 509908.

It is an arithmetic number, because the mean of its divisors is an integer number (8352376128).

Almost surely, 2^123531020761 is an apocalyptic number.

It is an amenable number.

123531020761 is a deficient number, since it is larger than the sum of its proper divisors (10106997287).

123531020761 is a wasteful number, since it uses less digits than its factorization.

123531020761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623952.

The product of its (nonzero) digits is 7560, while the sum is 31.

The spelling of 123531020761 in words is "one hundred twenty-three billion, five hundred thirty-one million, twenty thousand, seven hundred sixty-one".