431561994 has 32 divisors (see below), whose sum is σ = 871197120. Its totient is φ = 142515072.

The previous prime is 431561993. The next prime is 431562013. The reversal of 431561994 is 499165134.

It is not an unprimeable number, because it can be changed into a prime (431561993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 392854 + ... + 393950.

It is an arithmetic number, because the mean of its divisors is an integer number (27224910).

Almost surely, 2^431561994 is an apocalyptic number.

431561994 is an abundant number, since it is smaller than the sum of its proper divisors (439635126).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

431561994 is a wasteful number, since it uses less digits than its factorization.

431561994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654.

The product of its digits is 116640, while the sum is 42.

The square root of 431561994 is about 20774.0702319021. The cubic root of 431561994 is about 755.6970560513.

It can be divided in two parts, 43156 and 1994, that added together give a triangular number (45150 = T₃₀₀).

The spelling of 431561994 in words is "four hundred thirty-one million, five hundred sixty-one thousand, nine hundred ninety-four".