31474217 has 2 divisors, whose sum is σ = 31474218. Its totient is φ = 31474216.

The previous prime is 31474213. The next prime is 31474249. The reversal of 31474217 is 71247413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26739241 + 4734976 = 5171^2 + 2176^2 .

It is a cyclic number.

It is not a de Polignac number, because 31474217 - 2² = 31474213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31474217.

It is not a weakly prime, because it can be changed into another prime (31474213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15737108 + 15737109.

It is an arithmetic number, because the mean of its divisors is an integer number (15737109).

Almost surely, 2^31474217 is an apocalyptic number.

It is an amenable number.

31474217 is a deficient number, since it is larger than the sum of its proper divisors (1).

31474217 is an equidigital number, since it uses as much as digits as its factorization.

31474217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 29.

The square root of 31474217 is about 5610.1886777541. The cubic root of 31474217 is about 315.7317898551.

The spelling of 31474217 in words is "thirty-one million, four hundred seventy-four thousand, two hundred seventeen".