31330997 has 4 divisors (see below), whose sum is σ = 31345440. Its totient is φ = 31316556.

The previous prime is 31330993. The next prime is 31331023. The reversal of 31330997 is 79903313.

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 not a de Polignac number, because 31330997 - 2² = 31330993 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 (31330993) 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, 3233 + ... + 8550.

It is an arithmetic number, because the mean of its divisors is an integer number (7836360).

Almost surely, 2^31330997 is an apocalyptic number.

It is an amenable number.

31330997 is a deficient number, since it is larger than the sum of its proper divisors (14443).

31330997 is a wasteful number, since it uses less digits than its factorization.

31330997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14442.

The product of its (nonzero) digits is 15309, while the sum is 35.

The square root of 31330997 is about 5597.4098474205. The cubic root of 31330997 is about 315.2521605650.

It can be divided in two parts, 3 and 1330997, that added together give a cube (1331000 = 110³).

The spelling of 31330997 in words is "thirty-one million, three hundred thirty thousand, nine hundred ninety-seven".