251201089 has 2 divisors, whose sum is σ = 251201090. Its totient is φ = 251201088.

The previous prime is 251201081. The next prime is 251201107. The reversal of 251201089 is 980102152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169208064 + 81993025 = 13008^2 + 9055^2 .

It is a cyclic number.

It is not a de Polignac number, because 251201089 - 2³ = 251201081 is a prime.

It is a super-2 number, since 2×251201089² = 126203974229571842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251201081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125600544 + 125600545.

It is an arithmetic number, because the mean of its divisors is an integer number (125600545).

Almost surely, 2^251201089 is an apocalyptic number.

It is an amenable number.

251201089 is a deficient number, since it is larger than the sum of its proper divisors (1).

251201089 is an equidigital number, since it uses as much as digits as its factorization.

251201089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 251201089 is about 15849.3245597407. The cubic root of 251201089 is about 630.9677651612.

The spelling of 251201089 in words is "two hundred fifty-one million, two hundred one thousand, eighty-nine".