31420197 has 8 divisors (see below), whose sum is σ = 46548480. Its totient is φ = 20946780.

The previous prime is 31420189. The next prime is 31420217. The reversal of 31420197 is 79102413.

It is not a de Polignac number, because 31420197 - 2³ = 31420189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1163711 = 31420197 / (3 + 1 + 4 + 2 + 0 + 1 + 9 + 7).

It is a self number, because there is not a number n which added to its sum of digits gives 31420197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31420157) 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 7 ways as a sum of consecutive naturals, for example, 581829 + ... + 581882.

It is an arithmetic number, because the mean of its divisors is an integer number (5818560).

Almost surely, 2^31420197 is an apocalyptic number.

It is an amenable number.

31420197 is a deficient number, since it is larger than the sum of its proper divisors (15128283).

31420197 is a wasteful number, since it uses less digits than its factorization.

31420197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163720 (or 1163714 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 31420197 is about 5605.3721553524. The cubic root of 31420197 is about 315.5510535783.

The spelling of 31420197 in words is "thirty-one million, four hundred twenty thousand, one hundred ninety-seven".