1338767961 has 4 divisors (see below), whose sum is σ = 1785023952. Its totient is φ = 892511972.

The previous prime is 1338767921. The next prime is 1338767971. The reversal of 1338767961 is 1697678331.

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.

It is a cyclic number.

It is not a de Polignac number, because 1338767961 - 2⁹ = 1338767449 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1338767921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223127991 + ... + 223127996.

It is an arithmetic number, because the mean of its divisors is an integer number (446255988).

Almost surely, 2^1338767961 is an apocalyptic number.

It is an amenable number.

1338767961 is a deficient number, since it is larger than the sum of its proper divisors (446255991).

1338767961 is an equidigital number, since it uses as much as digits as its factorization.

1338767961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446255990.

The product of its digits is 1143072, while the sum is 51.

The square root of 1338767961 is about 36589.1781951986. The cubic root of 1338767961 is about 1102.1357845888.

The spelling of 1338767961 in words is "one billion, three hundred thirty-eight million, seven hundred sixty-seven thousand, nine hundred sixty-one".