1347491991 has 8 divisors (see below), whose sum is σ = 1797660784. Its totient is φ = 897825600.

The previous prime is 1347491939. The next prime is 1347492023. The reversal of 1347491991 is 1991947431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1347491991 - 2¹⁷ = 1347360919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1347491991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1347491591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119296 + ... + 130101.

It is an arithmetic number, because the mean of its divisors is an integer number (224707598).

Almost surely, 2^1347491991 is an apocalyptic number.

1347491991 is a deficient number, since it is larger than the sum of its proper divisors (450168793).

1347491991 is a wasteful number, since it uses less digits than its factorization.

1347491991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251201.

The product of its digits is 244944, while the sum is 48.

The square root of 1347491991 is about 36708.2005960521. The cubic root of 1347491991 is about 1104.5246116820.

The spelling of 1347491991 in words is "one billion, three hundred forty-seven million, four hundred ninety-one thousand, nine hundred ninety-one".