1348631991 has 16 divisors (see below), whose sum is σ = 2283398400. Its totient is φ = 770646744.

The previous prime is 1348631969. The next prime is 1348632001. The reversal of 1348631991 is 1991368431.

1348631991 is a `hidden beast` number, since 1 + 3 + 4 + 8 + 631 + 9 + 9 + 1 = 666.

It is not a de Polignac number, because 1348631991 - 2¹¹ = 1348629943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1348631941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3567621 + ... + 3567998.

It is an arithmetic number, because the mean of its divisors is an integer number (142712400).

Almost surely, 2^1348631991 is an apocalyptic number.

1348631991 is a deficient number, since it is larger than the sum of its proper divisors (934766409).

1348631991 is an equidigital number, since it uses as much as digits as its factorization.

1348631991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7135635 (or 7135629 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 1348631991 is about 36723.7251786907. The cubic root of 1348631991 is about 1104.8360057740.

The spelling of 1348631991 in words is "one billion, three hundred forty-eight million, six hundred thirty-one thousand, nine hundred ninety-one".