1361816961 has 4 divisors (see below), whose sum is σ = 1815755952. Its totient is φ = 907877972.

The previous prime is 1361816957. The next prime is 1361816969. The reversal of 1361816961 is 1696181631.

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 1361816961 - 2² = 1361816957 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1361816969) 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, 226969491 + ... + 226969496.

It is an arithmetic number, because the mean of its divisors is an integer number (453938988).

Almost surely, 2^1361816961 is an apocalyptic number.

It is an amenable number.

1361816961 is a deficient number, since it is larger than the sum of its proper divisors (453938991).

1361816961 is an equidigital number, since it uses as much as digits as its factorization.

1361816961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453938990.

The product of its digits is 46656, while the sum is 42.

The square root of 1361816961 is about 36902.8042430382. The cubic root of 1361816961 is about 1108.4248309536.

The spelling of 1361816961 in words is "one billion, three hundred sixty-one million, eight hundred sixteen thousand, nine hundred sixty-one".