120645531 has 10 divisors (see below), whose sum is σ = 180223692. Its totient is φ = 80430300.

The previous prime is 120645479. The next prime is 120645533. The reversal of 120645531 is 135546021.

120645531 is a `hidden beast` number, since 1 + 206 + 455 + 3 + 1 = 666.

It is not a de Polignac number, because 120645531 - 2¹⁰ = 120644507 is a prime.

It is a super-2 number, since 2×120645531² = 29110688300543922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 120645495 and 120645504.

It is not an unprimeable number, because it can be changed into a prime (120645533) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 744645 + ... + 744806.

Almost surely, 2^120645531 is an apocalyptic number.

120645531 is a deficient number, since it is larger than the sum of its proper divisors (59578161).

120645531 is an equidigital number, since it uses as much as digits as its factorization.

120645531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489463 (or 1489454 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 120645531 is about 10983.8759552355. The cubic root of 120645531 is about 494.1252871643.

The spelling of 120645531 in words is "one hundred twenty million, six hundred forty-five thousand, five hundred thirty-one".