251466749 has 2 divisors, whose sum is σ = 251466750. Its totient is φ = 251466748.

The previous prime is 251466727. The next prime is 251466769. The reversal of 251466749 is 947664152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214476025 + 36990724 = 14645^2 + 6082^2 .

It is a cyclic number.

It is not a de Polignac number, because 251466749 - 2²⁰ = 250418173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251466769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125733374 + 125733375.

It is an arithmetic number, because the mean of its divisors is an integer number (125733375).

Almost surely, 2^251466749 is an apocalyptic number.

It is an amenable number.

251466749 is a deficient number, since it is larger than the sum of its proper divisors (1).

251466749 is an equidigital number, since it uses as much as digits as its factorization.

251466749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 44.

The square root of 251466749 is about 15857.7031438982. The cubic root of 251466749 is about 631.1901153661.

The spelling of 251466749 in words is "two hundred fifty-one million, four hundred sixty-six thousand, seven hundred forty-nine".