31290497 has 8 divisors (see below), whose sum is σ = 35796096. Its totient is φ = 26793792.

The previous prime is 31290487. The next prime is 31290509. The reversal of 31290497 is 79409213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31290497 - 2¹² = 31286401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31290437) 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 7 ways as a sum of consecutive naturals, for example, 9353 + ... + 12249.

It is an arithmetic number, because the mean of its divisors is an integer number (4474512).

Almost surely, 2^31290497 is an apocalyptic number.

It is an amenable number.

31290497 is a deficient number, since it is larger than the sum of its proper divisors (4505599).

31290497 is a wasteful number, since it uses less digits than its factorization.

31290497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4447.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 31290497 is about 5593.7909328111. The cubic root of 31290497 is about 315.1162651358.

It can be divided in two parts, 312 and 90497, that added together give a palindrome (90809).

The spelling of 31290497 in words is "thirty-one million, two hundred ninety thousand, four hundred ninety-seven".