1961838243 has 12 divisors (see below), whose sum is σ = 2844544560. Its totient is φ = 1302917616.

The previous prime is 1961838239. The next prime is 1961838257. The reversal of 1961838243 is 3428381691.

1961838243 is a `hidden beast` number, since 1 + 9 + 618 + 3 + 8 + 24 + 3 = 666.

It is not a de Polignac number, because 1961838243 - 2² = 1961838239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1961838283) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 412048 + ... + 416781.

It is an arithmetic number, because the mean of its divisors is an integer number (237045380).

Almost surely, 2^1961838243 is an apocalyptic number.

1961838243 is a deficient number, since it is larger than the sum of its proper divisors (882706317).

1961838243 is a wasteful number, since it uses less digits than its factorization.

1961838243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829098 (or 829095 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 1961838243 is about 44292.6432153241. The cubic root of 1961838243 is about 1251.8560678191.

The spelling of 1961838243 in words is "one billion, nine hundred sixty-one million, eight hundred thirty-eight thousand, two hundred forty-three".