1343777981 has 24 divisors (see below), whose sum is σ = 1681784640. Its totient is φ = 1051180416.

The previous prime is 1343777969. The next prime is 1343778043. The reversal of 1343777981 is 1897773431.

It is not a de Polignac number, because 1343777981 - 2⁶ = 1343777917 is a prime.

It is a super-2 number, since 2×1343777981² = 3611478524440872722, 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 (1343771981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98906 + ... + 111668.

It is an arithmetic number, because the mean of its divisors is an integer number (70074360).

Almost surely, 2^1343777981 is an apocalyptic number.

It is an amenable number.

1343777981 is a deficient number, since it is larger than the sum of its proper divisors (338006659).

1343777981 is a wasteful number, since it uses less digits than its factorization.

1343777981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12885 (or 12872 counting only the distinct ones).

The product of its digits is 889056, while the sum is 50.

The square root of 1343777981 is about 36657.5774022234. The cubic root of 1343777981 is about 1103.5088999851.

The spelling of 1343777981 in words is "one billion, three hundred forty-three million, seven hundred seventy-seven thousand, nine hundred eighty-one".