120306531 has 4 divisors (see below), whose sum is σ = 160408712. Its totient is φ = 80204352.

The previous prime is 120306523. The next prime is 120306547. The reversal of 120306531 is 135603021.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 120306531 - 2³ = 120306523 is a prime.

It is a super-2 number, since 2×120306531² = 28947322802507922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120306498 and 120306507.

It is not an unprimeable number, because it can be changed into a prime (120306631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20051086 + ... + 20051091.

It is an arithmetic number, because the mean of its divisors is an integer number (40102178).

Almost surely, 2^120306531 is an apocalyptic number.

120306531 is a deficient number, since it is larger than the sum of its proper divisors (40102181).

120306531 is an equidigital number, since it uses as much as digits as its factorization.

120306531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40102180.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 120306531 is about 10968.4333885929. The cubic root of 120306531 is about 493.6620413524.

Adding to 120306531 its reverse (135603021), we get a palindrome (255909552).

The spelling of 120306531 in words is "one hundred twenty million, three hundred six thousand, five hundred thirty-one".