120643731 has 24 divisors (see below), whose sum is σ = 190859760. Its totient is φ = 72979776.

The previous prime is 120643703. The next prime is 120643739. The reversal of 120643731 is 137346021.

120643731 is a `hidden beast` number, since 12 + 0 + 643 + 7 + 3 + 1 = 666.

It is not a de Polignac number, because 120643731 - 2⁷ = 120643603 is a prime.

It is a super-2 number, since 2×120643731² = 29109819659200722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 120643695 and 120643704.

It is not an unprimeable number, because it can be changed into a prime (120643739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1836 + ... + 15641.

It is an arithmetic number, because the mean of its divisors is an integer number (7952490).

Almost surely, 2^120643731 is an apocalyptic number.

120643731 is a deficient number, since it is larger than the sum of its proper divisors (70216029).

120643731 is a wasteful number, since it uses less digits than its factorization.

120643731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17555 (or 17552 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 120643731 is about 10983.7940166411. The cubic root of 120643731 is about 494.1228297451.

Adding to 120643731 its reverse (137346021), we get a palindrome (257989752).

The spelling of 120643731 in words is "one hundred twenty million, six hundred forty-three thousand, seven hundred thirty-one".