31421197 has 16 divisors (see below), whose sum is σ = 34209792. Its totient is φ = 28773360.

The previous prime is 31421189. The next prime is 31421213. The reversal of 31421197 is 79112413.

It is a cyclic number.

It is not a de Polignac number, because 31421197 - 2³ = 31421189 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 (31421107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90378 + ... + 90724.

It is an arithmetic number, because the mean of its divisors is an integer number (2138112).

Almost surely, 2^31421197 is an apocalyptic number.

It is an amenable number.

31421197 is a deficient number, since it is larger than the sum of its proper divisors (2788595).

31421197 is a wasteful number, since it uses less digits than its factorization.

31421197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528.

The product of its digits is 1512, while the sum is 28.

The square root of 31421197 is about 5605.4613547861. The cubic root of 31421197 is about 315.5544011884.

The spelling of 31421197 in words is "thirty-one million, four hundred twenty-one thousand, one hundred ninety-seven".