31431601 has 4 divisors (see below), whose sum is σ = 31964400. Its totient is φ = 30898804.

The previous prime is 31431599. The next prime is 31431619. The reversal of 31431601 is 10613413.

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 31431601 - 2¹ = 31431599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31431641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266311 + ... + 266428.

It is an arithmetic number, because the mean of its divisors is an integer number (7991100).

Almost surely, 2^31431601 is an apocalyptic number.

It is an amenable number.

31431601 is a deficient number, since it is larger than the sum of its proper divisors (532799).

31431601 is an equidigital number, since it uses as much as digits as its factorization.

31431601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532798.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 31431601 is about 5606.3893015023. The cubic root of 31431601 is about 315.5892255110.

The spelling of 31431601 in words is "thirty-one million, four hundred thirty-one thousand, six hundred one".