431556149 has 4 divisors (see below), whose sum is σ = 438870720. Its totient is φ = 424241580.

The previous prime is 431556143. The next prime is 431556193. The reversal of 431556149 is 941655134.

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 431556149 - 2²⁴ = 414778933 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 (431556143) 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, 3657197 + ... + 3657314.

It is an arithmetic number, because the mean of its divisors is an integer number (109717680).

Almost surely, 2^431556149 is an apocalyptic number.

It is an amenable number.

431556149 is a deficient number, since it is larger than the sum of its proper divisors (7314571).

431556149 is an equidigital number, since it uses as much as digits as its factorization.

431556149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7314570.

The product of its digits is 64800, while the sum is 38.

The square root of 431556149 is about 20773.9295512428. The cubic root of 431556149 is about 755.6936443598.

The spelling of 431556149 in words is "four hundred thirty-one million, five hundred fifty-six thousand, one hundred forty-nine".