120505510031 has 4 divisors (see below), whose sum is σ = 121385112432. Its totient is φ = 119625907632.

The previous prime is 120505509991. The next prime is 120505510051. The reversal of 120505510031 is 130015505021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130015505021 = 1637 ⋅79423033.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120505510031 is a prime.

It is a super-2 number, since 2×120505510031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120505509979 and 120505510006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120505510051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439800995 + ... + 439801268.

It is an arithmetic number, because the mean of its divisors is an integer number (30346278108).

Almost surely, 2^120505510031 is an apocalyptic number.

120505510031 is a deficient number, since it is larger than the sum of its proper divisors (879602401).

120505510031 is an equidigital number, since it uses as much as digits as its factorization.

120505510031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879602400.

The product of its (nonzero) digits is 750, while the sum is 23.

The spelling of 120505510031 in words is "one hundred twenty billion, five hundred five million, five hundred ten thousand, thirty-one".