31231097 has 2 divisors, whose sum is σ = 31231098. Its totient is φ = 31231096.

The previous prime is 31231073. The next prime is 31231099. The reversal of 31231097 is 79013213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29800681 + 1430416 = 5459^2 + 1196^2 .

It is a cyclic number.

It is not a de Polignac number, because 31231097 - 2¹⁴ = 31214713 is a prime.

Together with 31231099, 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 (31231099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615548 + 15615549.

It is an arithmetic number, because the mean of its divisors is an integer number (15615549).

Almost surely, 2^31231097 is an apocalyptic number.

It is an amenable number.

31231097 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231097 is an equidigital number, since it uses as much as digits as its factorization.

31231097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 31231097 is about 5588.4789522731. The cubic root of 31231097 is about 314.9167395635.

The spelling of 31231097 in words is "thirty-one million, two hundred thirty-one thousand, ninety-seven".