190609621 has 2 divisors, whose sum is σ = 190609622. Its totient is φ = 190609620.

The previous prime is 190609619. The next prime is 190609633. The reversal of 190609621 is 126906091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177023025 + 13586596 = 13305^2 + 3686^2 .

It is a cyclic number.

It is not a de Polignac number, because 190609621 - 2¹ = 190609619 is a prime.

Together with 190609619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190609921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95304810 + 95304811.

It is an arithmetic number, because the mean of its divisors is an integer number (95304811).

Almost surely, 2^190609621 is an apocalyptic number.

It is an amenable number.

190609621 is a deficient number, since it is larger than the sum of its proper divisors (1).

190609621 is an equidigital number, since it uses as much as digits as its factorization.

190609621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 190609621 is about 13806.1443205553. The cubic root of 190609621 is about 575.5039020690.

The spelling of 190609621 in words is "one hundred ninety million, six hundred nine thousand, six hundred twenty-one".