181906051 has 2 divisors, whose sum is σ = 181906052. Its totient is φ = 181906050.

The previous prime is 181905973. The next prime is 181906061. The reversal of 181906051 is 150609181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 181906051 - 2¹⁹ = 181381763 is a prime.

It is a super-2 number, since 2×181906051² = 66179622780829202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (181906061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90953025 + 90953026.

It is an arithmetic number, because the mean of its divisors is an integer number (90953026).

Almost surely, 2^181906051 is an apocalyptic number.

181906051 is a deficient number, since it is larger than the sum of its proper divisors (1).

181906051 is an equidigital number, since it uses as much as digits as its factorization.

181906051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 181906051 is about 13487.2551321609. The cubic root of 181906051 is about 566.6075823441.

The spelling of 181906051 in words is "one hundred eighty-one million, nine hundred six thousand, fifty-one".