190810621 has 2 divisors, whose sum is σ = 190810622. Its totient is φ = 190810620.

The previous prime is 190810603. The next prime is 190810663. The reversal of 190810621 is 126018091.

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., 181440900 + 9369721 = 13470^2 + 3061^2 .

It is a cyclic number.

It is not a de Polignac number, because 190810621 - 2⁵ = 190810589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 190810621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190810681) 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, 95405310 + 95405311.

It is an arithmetic number, because the mean of its divisors is an integer number (95405311).

Almost surely, 2^190810621 is an apocalyptic number.

It is an amenable number.

190810621 is a deficient number, since it is larger than the sum of its proper divisors (1).

190810621 is an equidigital number, since it uses as much as digits as its factorization.

190810621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 190810621 is about 13813.4217701480. The cubic root of 190810621 is about 575.7061227944.

The spelling of 190810621 in words is "one hundred ninety million, eight hundred ten thousand, six hundred twenty-one".