31298997 has 4 divisors (see below), whose sum is σ = 41732000. Its totient is φ = 20865996.

The previous prime is 31298963. The next prime is 31298999. The reversal of 31298997 is 79989213.

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: 79989213 = 3 ⋅26663071.

It is a de Polignac number, because none of the positive numbers 2^k-31298997 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 (31298999) 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, 5216497 + ... + 5216502.

It is an arithmetic number, because the mean of its divisors is an integer number (10433000).

Almost surely, 2^31298997 is an apocalyptic number.

It is an amenable number.

31298997 is a deficient number, since it is larger than the sum of its proper divisors (10433003).

31298997 is a wasteful number, since it uses less digits than its factorization.

31298997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10433002.

The product of its digits is 244944, while the sum is 48.

The square root of 31298997 is about 5594.5506521972. The cubic root of 31298997 is about 315.1447961172.

The spelling of 31298997 in words is "thirty-one million, two hundred ninety-eight thousand, nine hundred ninety-seven".