31472291 has 2 divisors, whose sum is σ = 31472292. Its totient is φ = 31472290.

The previous prime is 31472261. The next prime is 31472293. The reversal of 31472291 is 19227413.

It is a strong prime.

It is an emirp because it is prime and its reverse (19227413) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31472291 is a prime.

Together with 31472293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31472293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15736145 + 15736146.

It is an arithmetic number, because the mean of its divisors is an integer number (15736146).

Almost surely, 2^31472291 is an apocalyptic number.

31472291 is a deficient number, since it is larger than the sum of its proper divisors (1).

31472291 is an equidigital number, since it uses as much as digits as its factorization.

31472291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 31472291 is about 5610.0170231471. The cubic root of 31472291 is about 315.7253495378.

The spelling of 31472291 in words is "thirty-one million, four hundred seventy-two thousand, two hundred ninety-one".