31148993 has 2 divisors, whose sum is σ = 31148994. Its totient is φ = 31148992.

The previous prime is 31148983. The next prime is 31149023. The reversal of 31148993 is 39984113.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21270544 + 9878449 = 4612^2 + 3143^2 .

It is a cyclic number.

It is not a de Polignac number, because 31148993 - 2⁴ = 31148977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31148983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15574496 + 15574497.

It is an arithmetic number, because the mean of its divisors is an integer number (15574497).

Almost surely, 2^31148993 is an apocalyptic number.

It is an amenable number.

31148993 is a deficient number, since it is larger than the sum of its proper divisors (1).

31148993 is an equidigital number, since it uses as much as digits as its factorization.

31148993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 31148993 is about 5581.1282909462. The cubic root of 31148993 is about 314.6405339295.

The spelling of 31148993 in words is "thirty-one million, one hundred forty-eight thousand, nine hundred ninety-three".