156434121 has 6 divisors (see below), whose sum is σ = 225960410. Its totient is φ = 104289408.

The previous prime is 156434071. The next prime is 156434123. The reversal of 156434121 is 121434651.

It is a happy number.

156434121 is a `hidden beast` number, since 1 + 5 + 643 + 4 + 12 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 136048896 + 20385225 = 11664^2 + 4515^2 .

It is not a de Polignac number, because 156434121 - 2¹⁵ = 156401353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (156434123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8690776 + ... + 8690793.

Almost surely, 2^156434121 is an apocalyptic number.

It is an amenable number.

156434121 is a deficient number, since it is larger than the sum of its proper divisors (69526289).

156434121 is a wasteful number, since it uses less digits than its factorization.

156434121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17381575 (or 17381572 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 156434121 is about 12507.3626716427. The cubic root of 156434121 is about 538.8201503535.

Adding to 156434121 its reverse (121434651), we get a palindrome (277868772).

The spelling of 156434121 in words is "one hundred fifty-six million, four hundred thirty-four thousand, one hundred twenty-one".