251020993 has 2 divisors, whose sum is σ = 251020994. Its totient is φ = 251020992.

The previous prime is 251020969. The next prime is 251021009. The reversal of 251020993 is 399020152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 237683889 + 13337104 = 15417^2 + 3652^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251020993 is a prime.

It is not a weakly prime, because it can be changed into another prime (251020933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125510496 + 125510497.

It is an arithmetic number, because the mean of its divisors is an integer number (125510497).

Almost surely, 2^251020993 is an apocalyptic number.

It is an amenable number.

251020993 is a deficient number, since it is larger than the sum of its proper divisors (1).

251020993 is an equidigital number, since it uses as much as digits as its factorization.

251020993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 251020993 is about 15843.6420371075. The cubic root of 251020993 is about 630.8169405259.

The spelling of 251020993 in words is "two hundred fifty-one million, twenty thousand, nine hundred ninety-three".