991379619 has 12 divisors (see below), whose sum is σ = 1432266576. Its totient is φ = 660793392.

The previous prime is 991379581. The next prime is 991379621. The reversal of 991379619 is 916973199.

991379619 is a `hidden beast` number, since 9 + 9 + 13 + 7 + 9 + 619 = 666.

It is not a de Polignac number, because 991379619 - 2⁹ = 991379107 is a prime.

It is a super-2 number, since 2×991379619² = 1965667097937170322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (991379629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81402 + ... + 92784.

It is an arithmetic number, because the mean of its divisors is an integer number (119355548).

Almost surely, 2^991379619 is an apocalyptic number.

991379619 is a deficient number, since it is larger than the sum of its proper divisors (440886957).

991379619 is a wasteful number, since it uses less digits than its factorization.

991379619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21066 (or 21063 counting only the distinct ones).

The product of its digits is 826686, while the sum is 54.

The square root of 991379619 is about 31486.1813975592. The cubic root of 991379619 is about 997.1182431212.

The spelling of 991379619 in words is "nine hundred ninety-one million, three hundred seventy-nine thousand, six hundred nineteen".