31126993 has 2 divisors, whose sum is σ = 31126994. Its totient is φ = 31126992.

The previous prime is 31126973. The next prime is 31126999. The reversal of 31126993 is 39962113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19210689 + 11916304 = 4383^2 + 3452^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31126993 is a prime.

It is not a weakly prime, because it can be changed into another prime (31126999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15563496 + 15563497.

It is an arithmetic number, because the mean of its divisors is an integer number (15563497).

Almost surely, 2^31126993 is an apocalyptic number.

It is an amenable number.

31126993 is a deficient number, since it is larger than the sum of its proper divisors (1).

31126993 is an equidigital number, since it uses as much as digits as its factorization.

31126993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 34.

The square root of 31126993 is about 5579.1570151771. The cubic root of 31126993 is about 314.5664414108.

The spelling of 31126993 in words is "thirty-one million, one hundred twenty-six thousand, nine hundred ninety-three".