31427497 has 2 divisors, whose sum is σ = 31427498. Its totient is φ = 31427496.

The previous prime is 31427477. The next prime is 31427507. The reversal of 31427497 is 79472413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23609881 + 7817616 = 4859^2 + 2796^2 .

It is an emirp because it is prime and its reverse (79472413) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31427497 is a prime.

It is not a weakly prime, because it can be changed into another prime (31427477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15713748 + 15713749.

It is an arithmetic number, because the mean of its divisors is an integer number (15713749).

Almost surely, 2^31427497 is an apocalyptic number.

It is an amenable number.

31427497 is a deficient number, since it is larger than the sum of its proper divisors (1).

31427497 is an equidigital number, since it uses as much as digits as its factorization.

31427497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 37.

The square root of 31427497 is about 5606.0232785817. The cubic root of 31427497 is about 315.5754894989.

The spelling of 31427497 in words is "thirty-one million, four hundred twenty-seven thousand, four hundred ninety-seven".