31730401 has 4 divisors (see below), whose sum is σ = 31813632. Its totient is φ = 31647172.

The previous prime is 31730393. The next prime is 31730407. The reversal of 31730401 is 10403713.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10403713 = 127 ⋅81919.

It is a cyclic number.

It is not a de Polignac number, because 31730401 - 2³ = 31730393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31730407) 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, 41041 + ... + 41806.

It is an arithmetic number, because the mean of its divisors is an integer number (7953408).

Almost surely, 2^31730401 is an apocalyptic number.

It is an amenable number.

31730401 is a deficient number, since it is larger than the sum of its proper divisors (83231).

31730401 is an equidigital number, since it uses as much as digits as its factorization.

31730401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83230.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 31730401 is about 5632.9744362992. The cubic root of 31730401 is about 316.5861077935.

It can be divided in two parts, 31730 and 401, that added together give a triangular number (32131 = T₂₅₃).

The spelling of 31730401 in words is "thirty-one million, seven hundred thirty thousand, four hundred one".