1319551949 has 4 divisors (see below), whose sum is σ = 1319643936. Its totient is φ = 1319459964.

The previous prime is 1319551943. The next prime is 1319551967. The reversal of 1319551949 is 9491559131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1319551949 is a prime.

It is a super-2 number, since 2×1319551949² = 3482434692219397202, 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 (1319551943) 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 3 ways as a sum of consecutive naturals, for example, 19319 + ... + 54884.

It is an arithmetic number, because the mean of its divisors is an integer number (329910984).

Almost surely, 2^1319551949 is an apocalyptic number.

It is an amenable number.

1319551949 is a deficient number, since it is larger than the sum of its proper divisors (91987).

1319551949 is an equidigital number, since it uses as much as digits as its factorization.

1319551949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91986.

The product of its digits is 218700, while the sum is 47.

The square root of 1319551949 is about 36325.6376268883. The cubic root of 1319551949 is about 1096.8371816400.

The spelling of 1319551949 in words is "one billion, three hundred nineteen million, five hundred fifty-one thousand, nine hundred forty-nine".