31421743 has 4 divisors (see below), whose sum is σ = 31474800. Its totient is φ = 31368688.

The previous prime is 31421737. The next prime is 31421759. The reversal of 31421743 is 34712413.

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

It is a cyclic number.

It is not a de Polignac number, because 31421743 - 2⁵ = 31421711 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 (31421713) 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, 25630 + ... + 26827.

It is an arithmetic number, because the mean of its divisors is an integer number (7868700).

Almost surely, 2^31421743 is an apocalyptic number.

31421743 is a deficient number, since it is larger than the sum of its proper divisors (53057).

31421743 is an equidigital number, since it uses as much as digits as its factorization.

31421743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53056.

The product of its digits is 2016, while the sum is 25.

The square root of 31421743 is about 5605.5100570778. The cubic root of 31421743 is about 315.5562289535.

The spelling of 31421743 in words is "thirty-one million, four hundred twenty-one thousand, seven hundred forty-three".