190901591 has 2 divisors, whose sum is σ = 190901592. Its totient is φ = 190901590.

The previous prime is 190901567. The next prime is 190901593. The reversal of 190901591 is 195109091.

It is a strong prime.

It is an emirp because it is prime and its reverse (195109091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 190901591 - 2¹⁴ = 190885207 is a prime.

Together with 190901593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190901593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95450795 + 95450796.

It is an arithmetic number, because the mean of its divisors is an integer number (95450796).

Almost surely, 2^190901591 is an apocalyptic number.

190901591 is a deficient number, since it is larger than the sum of its proper divisors (1).

190901591 is an equidigital number, since it uses as much as digits as its factorization.

190901591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3645, while the sum is 35.

The square root of 190901591 is about 13816.7141897052. The cubic root of 190901591 is about 575.7975985991.

The spelling of 190901591 in words is "one hundred ninety million, nine hundred one thousand, five hundred ninety-one".