431923861 has 4 divisors (see below), whose sum is σ = 431983872. Its totient is φ = 431863852.

The previous prime is 431923847. The next prime is 431923867. The reversal of 431923861 is 168329134.

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 a de Polignac number, because none of the positive numbers 2^k-431923861 is a prime.

It is a super-2 number, since 2×431923861² = 373116443402294642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 431923861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431923867) 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, 17461 + ... + 34186.

It is an arithmetic number, because the mean of its divisors is an integer number (107995968).

Almost surely, 2^431923861 is an apocalyptic number.

It is an amenable number.

431923861 is a deficient number, since it is larger than the sum of its proper divisors (60011).

431923861 is an equidigital number, since it uses as much as digits as its factorization.

431923861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60010.

The product of its digits is 31104, while the sum is 37.

The square root of 431923861 is about 20782.7779904420. Note that the first 3 decimals coincide. The cubic root of 431923861 is about 755.9082156938.

The spelling of 431923861 in words is "four hundred thirty-one million, nine hundred twenty-three thousand, eight hundred sixty-one".