1919158091 has 2 divisors, whose sum is σ = 1919158092. Its totient is φ = 1919158090.

The previous prime is 1919158081. The next prime is 1919158103. The reversal of 1919158091 is 1908519191.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1919158091 is a prime.

It is not a weakly prime, because it can be changed into another prime (1919158051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959579045 + 959579046.

It is an arithmetic number, because the mean of its divisors is an integer number (959579046).

Almost surely, 2^1919158091 is an apocalyptic number.

1919158091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1919158091 is an equidigital number, since it uses as much as digits as its factorization.

1919158091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 44.

The square root of 1919158091 is about 43808.1966188977. The cubic root of 1919158091 is about 1242.7113086681.

The spelling of 1919158091 in words is "one billion, nine hundred nineteen million, one hundred fifty-eight thousand, ninety-one".