1319604991 has 4 divisors (see below), whose sum is σ = 1397228832. Its totient is φ = 1241981152.

The previous prime is 1319604989. The next prime is 1319605039. The reversal of 1319604991 is 1994069131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1319604991 - 2¹ = 1319604989 is a prime.

It is a super-2 number, since 2×1319604991² = 3482714664544220162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1319604901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38811895 + ... + 38811928.

It is an arithmetic number, because the mean of its divisors is an integer number (349307208).

Almost surely, 2^1319604991 is an apocalyptic number.

1319604991 is a deficient number, since it is larger than the sum of its proper divisors (77623841).

1319604991 is an equidigital number, since it uses as much as digits as its factorization.

1319604991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77623840.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 1319604991 is about 36326.3677099707. The cubic root of 1319604991 is about 1096.8518779562.

The spelling of 1319604991 in words is "one billion, three hundred nineteen million, six hundred four thousand, nine hundred ninety-one".