91138228619 has 2 divisors, whose sum is σ = 91138228620. Its totient is φ = 91138228618.

The previous prime is 91138228603. The next prime is 91138228667. The reversal of 91138228619 is 91682283119.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91138228619 - 2⁴ = 91138228603 is a prime.

It is a super-2 number, since 2×91138228619² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91138228679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45569114309 + 45569114310.

It is an arithmetic number, because the mean of its divisors is an integer number (45569114310).

Almost surely, 2^91138228619 is an apocalyptic number.

91138228619 is a deficient number, since it is larger than the sum of its proper divisors (1).

91138228619 is an equidigital number, since it uses as much as digits as its factorization.

91138228619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 50.

The spelling of 91138228619 in words is "ninety-one billion, one hundred thirty-eight million, two hundred twenty-eight thousand, six hundred nineteen".