31109597 has 4 divisors (see below), whose sum is σ = 31833120. Its totient is φ = 30386076.

The previous prime is 31109587. The next prime is 31109599. The reversal of 31109597 is 79590113.

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: 79590113 = 31 ⋅2567423.

It is a cyclic number.

It is not a de Polignac number, because 31109597 - 2¹⁴ = 31093213 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 (31109599) 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, 361697 + ... + 361782.

It is an arithmetic number, because the mean of its divisors is an integer number (7958280).

Almost surely, 2^31109597 is an apocalyptic number.

It is an amenable number.

31109597 is a deficient number, since it is larger than the sum of its proper divisors (723523).

31109597 is an equidigital number, since it uses as much as digits as its factorization.

31109597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723522.

The product of its (nonzero) digits is 8505, while the sum is 35.

The square root of 31109597 is about 5577.5977804069. The cubic root of 31109597 is about 314.5078297148.

The spelling of 31109597 in words is "thirty-one million, one hundred nine thousand, five hundred ninety-seven".