190561421 has 2 divisors, whose sum is σ = 190561422. Its totient is φ = 190561420.

The previous prime is 190561411. The next prime is 190561429. The reversal of 190561421 is 124165091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137475625 + 53085796 = 11725^2 + 7286^2 .

It is an emirp because it is prime and its reverse (124165091) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-190561421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190561429) 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, 95280710 + 95280711.

It is an arithmetic number, because the mean of its divisors is an integer number (95280711).

Almost surely, 2^190561421 is an apocalyptic number.

It is an amenable number.

190561421 is a deficient number, since it is larger than the sum of its proper divisors (1).

190561421 is an equidigital number, since it uses as much as digits as its factorization.

190561421 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 29.

The square root of 190561421 is about 13804.3986105879. The cubic root of 190561421 is about 575.4553882070.

The spelling of 190561421 in words is "one hundred ninety million, five hundred sixty-one thousand, four hundred twenty-one".