19925161 has 2 divisors, whose sum is σ = 19925162. Its totient is φ = 19925160.

The previous prime is 19925149. The next prime is 19925183. The reversal of 19925161 is 16152991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17139600 + 2785561 = 4140^2 + 1669^2 .

It is a cyclic number.

It is not a de Polignac number, because 19925161 - 2¹⁵ = 19892393 is a prime.

It is not a weakly prime, because it can be changed into another prime (19925111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9962580 + 9962581.

It is an arithmetic number, because the mean of its divisors is an integer number (9962581).

Almost surely, 2^19925161 is an apocalyptic number.

It is an amenable number.

19925161 is a deficient number, since it is larger than the sum of its proper divisors (1).

19925161 is an equidigital number, since it uses as much as digits as its factorization.

19925161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 34.

The square root of 19925161 is about 4463.7608582898. The cubic root of 19925161 is about 271.1027646372.

The spelling of 19925161 in words is "nineteen million, nine hundred twenty-five thousand, one hundred sixty-one".