251198011 has 2 divisors, whose sum is σ = 251198012. Its totient is φ = 251198010.

The previous prime is 251197981. The next prime is 251198023. The reversal of 251198011 is 110891152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251198011 - 2⁷ = 251197883 is a prime.

It is a super-2 number, since 2×251198011² = 126200881460712242, which contains 22 as substring.

It is equal to p_13741291 and since 251198011 and 13741291 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 (251198041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125599005 + 125599006.

It is an arithmetic number, because the mean of its divisors is an integer number (125599006).

Almost surely, 2^251198011 is an apocalyptic number.

251198011 is a deficient number, since it is larger than the sum of its proper divisors (1).

251198011 is an equidigital number, since it uses as much as digits as its factorization.

251198011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 28.

The square root of 251198011 is about 15849.2274575135. The cubic root of 251198011 is about 630.9651880403.

The spelling of 251198011 in words is "two hundred fifty-one million, one hundred ninety-eight thousand, eleven".