31730057 has 4 divisors (see below), whose sum is σ = 33400080. Its totient is φ = 30060036.

The previous prime is 31730051. The next prime is 31730063. The reversal of 31730057 is 75003713.

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 an interprime number because it is at equal distance from previous prime (31730051) and next prime (31730063).

It is a cyclic number.

It is not a de Polignac number, because 31730057 - 2⁶ = 31729993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31730051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 834983 + ... + 835020.

It is an arithmetic number, because the mean of its divisors is an integer number (8350020).

Almost surely, 2^31730057 is an apocalyptic number.

It is an amenable number.

31730057 is a deficient number, since it is larger than the sum of its proper divisors (1670023).

31730057 is a wasteful number, since it uses less digits than its factorization.

31730057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670022.

The product of its (nonzero) digits is 2205, while the sum is 26.

The square root of 31730057 is about 5632.9439017267. The cubic root of 31730057 is about 316.5849637170.

The spelling of 31730057 in words is "thirty-one million, seven hundred thirty thousand, fifty-seven".