120615551 has 8 divisors (see below), whose sum is σ = 137922720. Its totient is φ = 103327488.

The previous prime is 120615533. The next prime is 120615557. The reversal of 120615551 is 155516021.

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

It is a cyclic number.

It is not a de Polignac number, because 120615551 - 2⁶ = 120615487 is a prime.

It is a super-2 number, since 2×120615551² = 29096222286067202, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 120615551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120615557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13355 + ... + 20483.

It is an arithmetic number, because the mean of its divisors is an integer number (17240340).

Almost surely, 2^120615551 is an apocalyptic number.

120615551 is a deficient number, since it is larger than the sum of its proper divisors (17307169).

120615551 is an equidigital number, since it uses as much as digits as its factorization.

120615551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9553.

The product of its (nonzero) digits is 1500, while the sum is 26.

The square root of 120615551 is about 10982.5111427214. The cubic root of 120615551 is about 494.0843542947.

The spelling of 120615551 in words is "one hundred twenty million, six hundred fifteen thousand, five hundred fifty-one".