1319253991 has 4 divisors (see below), whose sum is σ = 1439186184. Its totient is φ = 1199321800.

The previous prime is 1319253989. The next prime is 1319254019. The reversal of 1319253991 is 1993529131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1993529131 = 11 ⋅181229921.

It is a cyclic number.

It is not a de Polignac number, because 1319253991 - 2¹ = 1319253989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1319263991) 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, 59966080 + ... + 59966101.

It is an arithmetic number, because the mean of its divisors is an integer number (359796546).

Almost surely, 2^1319253991 is an apocalyptic number.

1319253991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1319253991 is a deficient number, since it is larger than the sum of its proper divisors (119932193).

1319253991 is a wasteful number, since it uses less digits than its factorization.

1319253991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119932192.

The product of its digits is 65610, while the sum is 43.

The square root of 1319253991 is about 36321.5361872264. The cubic root of 1319253991 is about 1096.7546192686.

The spelling of 1319253991 in words is "one billion, three hundred nineteen million, two hundred fifty-three thousand, nine hundred ninety-one".