251941889 has 2 divisors, whose sum is σ = 251941890. Its totient is φ = 251941888.

The previous prime is 251941873. The next prime is 251941897. The reversal of 251941889 is 988149152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139051264 + 112890625 = 11792^2 + 10625^2 .

It is a cyclic number.

It is not a de Polignac number, because 251941889 - 2⁴ = 251941873 is a prime.

It is a Chen prime.

It is equal to p_13779668 and since 251941889 and 13779668 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (251941829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125970944 + 125970945.

It is an arithmetic number, because the mean of its divisors is an integer number (125970945).

Almost surely, 2^251941889 is an apocalyptic number.

It is an amenable number.

251941889 is a deficient number, since it is larger than the sum of its proper divisors (1).

251941889 is an equidigital number, since it uses as much as digits as its factorization.

251941889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 47.

The square root of 251941889 is about 15872.6774363999. The cubic root of 251941889 is about 631.5874044495.

The spelling of 251941889 in words is "two hundred fifty-one million, nine hundred forty-one thousand, eight hundred eighty-nine".