156012121 has 4 divisors (see below), whose sum is σ = 156097552. Its totient is φ = 155926692.

The previous prime is 156012053. The next prime is 156012133. The reversal of 156012121 is 121210651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 156012121 - 2⁷ = 156011993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156012191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39915 + ... + 43648.

It is an arithmetic number, because the mean of its divisors is an integer number (39024388).

Almost surely, 2^156012121 is an apocalyptic number.

It is an amenable number.

156012121 is a deficient number, since it is larger than the sum of its proper divisors (85431).

156012121 is an equidigital number, since it uses as much as digits as its factorization.

156012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85430.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 156012121 is about 12490.4812157098. The cubic root of 156012121 is about 538.3352031383.

Adding to 156012121 its reverse (121210651), we get a palindrome (277222772).

The spelling of 156012121 in words is "one hundred fifty-six million, twelve thousand, one hundred twenty-one".