31214257 has 4 divisors (see below), whose sum is σ = 31438960. Its totient is φ = 30989556.

The previous prime is 31214233. The next prime is 31214263. The reversal of 31214257 is 75241213.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-31214257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31214357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112143 + ... + 112420.

It is an arithmetic number, because the mean of its divisors is an integer number (7859740).

Almost surely, 2^31214257 is an apocalyptic number.

It is an amenable number.

31214257 is a deficient number, since it is larger than the sum of its proper divisors (224703).

31214257 is a wasteful number, since it uses less digits than its factorization.

31214257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224702.

The product of its digits is 1680, while the sum is 25.

The square root of 31214257 is about 5586.9720779685. The cubic root of 31214257 is about 314.8601277048.

The spelling of 31214257 in words is "thirty-one million, two hundred fourteen thousand, two hundred fifty-seven".