251999893 has 2 divisors, whose sum is σ = 251999894. Its totient is φ = 251999892.

The previous prime is 251999843. The next prime is 251999929. The reversal of 251999893 is 398999152.

251999893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 249103089 + 2896804 = 15783^2 + 1702^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251999893 is a prime.

It is a super-2 number, since 2×251999893² = 127007892144022898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251999833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125999946 + 125999947.

It is an arithmetic number, because the mean of its divisors is an integer number (125999947).

Almost surely, 2^251999893 is an apocalyptic number.

It is an amenable number.

251999893 is a deficient number, since it is larger than the sum of its proper divisors (1).

251999893 is an equidigital number, since it uses as much as digits as its factorization.

251999893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1574640, while the sum is 55.

The square root of 251999893 is about 15874.5044962040. The cubic root of 251999893 is about 631.6358703674.

The spelling of 251999893 in words is "two hundred fifty-one million, nine hundred ninety-nine thousand, eight hundred ninety-three".