156424421 has 4 divisors (see below), whose sum is σ = 156579852. Its totient is φ = 156268992.

The previous prime is 156424381. The next prime is 156424423. The reversal of 156424421 is 124424651.

156424421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2292196 + 154132225 = 1514^2 + 12415^2 .

It is a cyclic number.

It is not a de Polignac number, because 156424421 - 2¹⁴ = 156408037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156424423) 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, 76196 + ... + 78221.

It is an arithmetic number, because the mean of its divisors is an integer number (39144963).

Almost surely, 2^156424421 is an apocalyptic number.

It is an amenable number.

156424421 is a deficient number, since it is larger than the sum of its proper divisors (155431).

156424421 is a wasteful number, since it uses less digits than its factorization.

156424421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155430.

The product of its digits is 7680, while the sum is 29.

The square root of 156424421 is about 12506.9748940341. The cubic root of 156424421 is about 538.8090132617.

The spelling of 156424421 in words is "one hundred fifty-six million, four hundred twenty-four thousand, four hundred twenty-one".