431401111 has 4 divisors (see below), whose sum is σ = 434258224. Its totient is φ = 428544000.

The previous prime is 431401043. The next prime is 431401121. The reversal of 431401111 is 111104134.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431401111 is a prime.

It is a super-2 number, since 2×431401111² = 372213837144068642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431401121) 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, 1428330 + ... + 1428631.

It is an arithmetic number, because the mean of its divisors is an integer number (108564556).

Almost surely, 2^431401111 is an apocalyptic number.

431401111 is a deficient number, since it is larger than the sum of its proper divisors (2857113).

431401111 is a wasteful number, since it uses less digits than its factorization.

431401111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857112.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 431401111 is about 20770.1976639607. The cubic root of 431401111 is about 755.6031383584.

Adding to 431401111 its reverse (111104134), we get a palindrome (542505245).

The spelling of 431401111 in words is "four hundred thirty-one million, four hundred one thousand, one hundred eleven".