31309093 has 4 divisors (see below), whose sum is σ = 32956960. Its totient is φ = 29661228.

The previous prime is 31309079. The next prime is 31309111. The reversal of 31309093 is 39090313.

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, and also an emirpimes, since its reverse is a distinct semiprime: 39090313 = 89 ⋅439217.

It is a cyclic number.

It is not a de Polignac number, because 31309093 - 2¹³ = 31300901 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 (31309063) 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, 823905 + ... + 823942.

It is an arithmetic number, because the mean of its divisors is an integer number (8239240).

Almost surely, 2^31309093 is an apocalyptic number.

It is an amenable number.

31309093 is a deficient number, since it is larger than the sum of its proper divisors (1647867).

31309093 is a wasteful number, since it uses less digits than its factorization.

31309093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647866.

The product of its (nonzero) digits is 2187, while the sum is 28.

The square root of 31309093 is about 5595.4528860495. The cubic root of 31309093 is about 315.1786774991.

The spelling of 31309093 in words is "thirty-one million, three hundred nine thousand, ninety-three".