31193121 has 4 divisors (see below), whose sum is σ = 41590832. Its totient is φ = 20795412.

The previous prime is 31193093. The next prime is 31193131. The reversal of 31193121 is 12139113.

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 not a de Polignac number, because 31193121 - 2¹³ = 31184929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31193131) 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, 5198851 + ... + 5198856.

It is an arithmetic number, because the mean of its divisors is an integer number (10397708).

Almost surely, 2^31193121 is an apocalyptic number.

It is an amenable number.

31193121 is a deficient number, since it is larger than the sum of its proper divisors (10397711).

31193121 is a wasteful number, since it uses less digits than its factorization.

31193121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10397710.

The product of its digits is 162, while the sum is 21.

The square root of 31193121 is about 5585.0802142852. The cubic root of 31193121 is about 314.7890449482.

The spelling of 31193121 in words is "thirty-one million, one hundred ninety-three thousand, one hundred twenty-one".