1863961331 has 4 divisors (see below), whose sum is σ = 1945003152. Its totient is φ = 1782919512.

The previous prime is 1863961327. The next prime is 1863961343. The reversal of 1863961331 is 1331693681.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1863961331 - 2² = 1863961327 is a prime.

It is a super-2 number, since 2×1863961331² = 6948703686926583122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1863961361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40520876 + ... + 40520921.

It is an arithmetic number, because the mean of its divisors is an integer number (486250788).

Almost surely, 2^1863961331 is an apocalyptic number.

1863961331 is a deficient number, since it is larger than the sum of its proper divisors (81041821).

1863961331 is an equidigital number, since it uses as much as digits as its factorization.

1863961331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81041820.

The product of its digits is 69984, while the sum is 41.

The square root of 1863961331 is about 43173.6184608147. The cubic root of 1863961331 is about 1230.6813883828.

The spelling of 1863961331 in words is "one billion, eight hundred sixty-three million, nine hundred sixty-one thousand, three hundred thirty-one".