190066391 has 2 divisors, whose sum is σ = 190066392. Its totient is φ = 190066390.

The previous prime is 190066379. The next prime is 190066397. The reversal of 190066391 is 193660091.

It is a strong prime.

It is an emirp because it is prime and its reverse (193660091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 190066391 - 2²² = 185872087 is a prime.

It is a super-2 number, since 2×190066391² = 72250465975529762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190066397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95033195 + 95033196.

It is an arithmetic number, because the mean of its divisors is an integer number (95033196).

Almost surely, 2^190066391 is an apocalyptic number.

190066391 is a deficient number, since it is larger than the sum of its proper divisors (1).

190066391 is an equidigital number, since it uses as much as digits as its factorization.

190066391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 190066391 is about 13786.4567964361. The cubic root of 190066391 is about 574.9566606276.

The spelling of 190066391 in words is "one hundred ninety million, sixty-six thousand, three hundred ninety-one".