251106061 has 2 divisors, whose sum is σ = 251106062. Its totient is φ = 251106060.

The previous prime is 251106049. The next prime is 251106077. The reversal of 251106061 is 160601152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128029225 + 123076836 = 11315^2 + 11094^2 .

It is a cyclic number.

It is not a de Polignac number, because 251106061 - 2⁵ = 251106029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251106091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125553030 + 125553031.

It is an arithmetic number, because the mean of its divisors is an integer number (125553031).

Almost surely, 2^251106061 is an apocalyptic number.

It is an amenable number.

251106061 is a deficient number, since it is larger than the sum of its proper divisors (1).

251106061 is an equidigital number, since it uses as much as digits as its factorization.

251106061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 251106061 is about 15846.3264197100. The cubic root of 251106061 is about 630.8881912397. Note that the first 3 decimals are identical.

The spelling of 251106061 in words is "two hundred fifty-one million, one hundred six thousand, sixty-one".