1231862381 has 8 divisors (see below), whose sum is σ = 1315869624. Its totient is φ = 1149137920.

The previous prime is 1231862369. The next prime is 1231862383. The reversal of 1231862381 is 1832681321.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 226021156 + 1005841225 = 15034^2 + 31715^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231862381 - 2¹⁴ = 1231845997 is a prime.

It is a super-2 number, since 2×1231862381² = 3034969851445978322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231862383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318710 + ... + 322551.

It is an arithmetic number, because the mean of its divisors is an integer number (164483703).

Almost surely, 2^1231862381 is an apocalyptic number.

It is an amenable number.

1231862381 is a deficient number, since it is larger than the sum of its proper divisors (84007243).

1231862381 is a wasteful number, since it uses less digits than its factorization.

1231862381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641391.

The product of its digits is 13824, while the sum is 35.

The square root of 1231862381 is about 35097.8971022482. The cubic root of 1231862381 is about 1071.9817644319.

The spelling of 1231862381 in words is "one billion, two hundred thirty-one million, eight hundred sixty-two thousand, three hundred eighty-one".