919490191 has 2 divisors, whose sum is σ = 919490192. Its totient is φ = 919490190.

The previous prime is 919490183. The next prime is 919490207. The reversal of 919490191 is 191094919.

It is a weak prime.

It is an emirp because it is prime and its reverse (191094919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 919490191 - 2³ = 919490183 is a prime.

It is a super-2 number, since 2×919490191² = 1690924422690432962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (919490141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459745095 + 459745096.

It is an arithmetic number, because the mean of its divisors is an integer number (459745096).

Almost surely, 2^919490191 is an apocalyptic number.

919490191 is a deficient number, since it is larger than the sum of its proper divisors (1).

919490191 is an equidigital number, since it uses as much as digits as its factorization.

919490191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 43.

The square root of 919490191 is about 30323.0966591475. The cubic root of 919490191 is about 972.4091428303.

It can be divided in two parts, 919490 and 191, that added together give a square (919681 = 959²).

The spelling of 919490191 in words is "nine hundred nineteen million, four hundred ninety thousand, one hundred ninety-one".