120515631 has 8 divisors (see below), whose sum is σ = 165871104. Its totient is φ = 77751960.

The previous prime is 120515621. The next prime is 120515639. The reversal of 120515631 is 136515021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 120515631 - 2⁵ = 120515599 is a prime.

It is a super-3 number, since 3×120515631³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120515639) 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 7 ways as a sum of consecutive naturals, for example, 647841 + ... + 648026.

It is an arithmetic number, because the mean of its divisors is an integer number (20733888).

Almost surely, 2^120515631 is an apocalyptic number.

120515631 is a deficient number, since it is larger than the sum of its proper divisors (45355473).

120515631 is a wasteful number, since it uses less digits than its factorization.

120515631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295901.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 120515631 is about 10977.9611495031. The cubic root of 120515631 is about 493.9478806056.

It can be divided in two parts, 1205 and 15631, that added together give a triangular number (16836 = T₁₈₃).

The spelling of 120515631 in words is "one hundred twenty million, five hundred fifteen thousand, six hundred thirty-one".