31585397 has 4 divisors (see below), whose sum is σ = 31654080. Its totient is φ = 31516716.

The previous prime is 31585369. The next prime is 31585399. The reversal of 31585397 is 79358513.

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 31585397 - 2¹⁰ = 31584373 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 (31585399) 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, 33647 + ... + 34572.

It is an arithmetic number, because the mean of its divisors is an integer number (7913520).

Almost surely, 2^31585397 is an apocalyptic number.

It is an amenable number.

31585397 is a deficient number, since it is larger than the sum of its proper divisors (68683).

31585397 is an equidigital number, since it uses as much as digits as its factorization.

31585397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68682.

The product of its digits is 113400, while the sum is 41.

The square root of 31585397 is about 5620.0887003676. The cubic root of 31585397 is about 316.1031182185.

The spelling of 31585397 in words is "thirty-one million, five hundred eighty-five thousand, three hundred ninety-seven".