1311961949 has 8 divisors (see below), whose sum is σ = 1344628032. Its totient is φ = 1279393920.

The previous prime is 1311961921. The next prime is 1311961969. The reversal of 1311961949 is 9491691131.

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

It is a cyclic number.

It is not a de Polignac number, because 1311961949 - 2¹⁶ = 1311896413 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 (1311961969) 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, 2957 + ... + 51309.

It is an arithmetic number, because the mean of its divisors is an integer number (168078504).

Almost surely, 2^1311961949 is an apocalyptic number.

It is an amenable number.

1311961949 is a deficient number, since it is larger than the sum of its proper divisors (32666083).

1311961949 is an equidigital number, since it uses as much as digits as its factorization.

1311961949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49027.

The product of its digits is 52488, while the sum is 44.

The square root of 1311961949 is about 36221.0152949914. The cubic root of 1311961949 is about 1094.7301515292.

The spelling of 1311961949 in words is "one billion, three hundred eleven million, nine hundred sixty-one thousand, nine hundred forty-nine".