31240697 has 2 divisors, whose sum is σ = 31240698. Its totient is φ = 31240696.

The previous prime is 31240673. The next prime is 31240711. The reversal of 31240697 is 79604213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25110121 + 6130576 = 5011^2 + 2476^2 .

It is a cyclic number.

It is not a de Polignac number, because 31240697 - 2¹⁰ = 31239673 is a prime.

It is a super-2 number, since 2×31240697² = 1951962298091618, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31240637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15620348 + 15620349.

It is an arithmetic number, because the mean of its divisors is an integer number (15620349).

Almost surely, 2^31240697 is an apocalyptic number.

It is an amenable number.

31240697 is a deficient number, since it is larger than the sum of its proper divisors (1).

31240697 is an equidigital number, since it uses as much as digits as its factorization.

31240697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 31240697 is about 5589.3377961973. The cubic root of 31240697 is about 314.9490032502.

The spelling of 31240697 in words is "thirty-one million, two hundred forty thousand, six hundred ninety-seven".