31390117 has 4 divisors (see below), whose sum is σ = 34243776. Its totient is φ = 28536460.

The previous prime is 31390111. The next prime is 31390127. The reversal of 31390117 is 71109313.

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: 71109313 = 11 ⋅6464483.

It is a cyclic number.

It is not a de Polignac number, because 31390117 - 2⁷ = 31389989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31390091 and 31390100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31390111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1426813 + ... + 1426834.

It is an arithmetic number, because the mean of its divisors is an integer number (8560944).

Almost surely, 2^31390117 is an apocalyptic number.

It is an amenable number.

31390117 is a deficient number, since it is larger than the sum of its proper divisors (2853659).

31390117 is a wasteful number, since it uses less digits than its factorization.

31390117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2853658.

The product of its (nonzero) digits is 567, while the sum is 25.

The square root of 31390117 is about 5602.6883725583. The cubic root of 31390117 is about 315.4503242473.

The spelling of 31390117 in words is "thirty-one million, three hundred ninety thousand, one hundred seventeen".