120012551 has 4 divisors (see below), whose sum is σ = 125230512. Its totient is φ = 114794592.

The previous prime is 120012547. The next prime is 120012577. The reversal of 120012551 is 155210021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155210021 = 193 ⋅804197.

It is a cyclic number.

It is not a de Polignac number, because 120012551 - 2² = 120012547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120012521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2608946 + ... + 2608991.

It is an arithmetic number, because the mean of its divisors is an integer number (31307628).

Almost surely, 2^120012551 is an apocalyptic number.

120012551 is a deficient number, since it is larger than the sum of its proper divisors (5217961).

120012551 is an equidigital number, since it uses as much as digits as its factorization.

120012551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5217960.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 120012551 is about 10955.0240072763. The cubic root of 120012551 is about 493.2596106153.

Adding to 120012551 its reverse (155210021), we get a palindrome (275222572).

The spelling of 120012551 in words is "one hundred twenty million, twelve thousand, five hundred fifty-one".