189995651 has 2 divisors, whose sum is σ = 189995652. Its totient is φ = 189995650.

The previous prime is 189995609. The next prime is 189995653. The reversal of 189995651 is 156599981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189995651 - 2¹⁰ = 189994627 is a prime.

Together with 189995653, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 189995593 and 189995602.

It is not a weakly prime, because it can be changed into another prime (189995653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94997825 + 94997826.

It is an arithmetic number, because the mean of its divisors is an integer number (94997826).

Almost surely, 2^189995651 is an apocalyptic number.

189995651 is a deficient number, since it is larger than the sum of its proper divisors (1).

189995651 is an equidigital number, since it uses as much as digits as its factorization.

189995651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 874800, while the sum is 53.

The square root of 189995651 is about 13783.8909963769. The cubic root of 189995651 is about 574.8853215534.

The spelling of 189995651 in words is "one hundred eighty-nine million, nine hundred ninety-five thousand, six hundred fifty-one".