1231861326 has 8 divisors (see below), whose sum is σ = 2463722664. Its totient is φ = 410620440.

The previous prime is 1231861321. The next prime is 1231861331. The reversal of 1231861326 is 6231681321.

It is an interprime number because it is at equal distance from previous prime (1231861321) and next prime (1231861331).

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

1231861326 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231861321) 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, 102655105 + ... + 102655116.

It is an arithmetic number, because the mean of its divisors is an integer number (307965333).

Almost surely, 2^1231861326 is an apocalyptic number.

1231861326 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231861326 is a wasteful number, since it uses less digits than its factorization.

1231861326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205310226.

The product of its digits is 10368, while the sum is 33.

The square root of 1231861326 is about 35097.8820728545. The cubic root of 1231861326 is about 1071.9814584071.

The spelling of 1231861326 in words is "one billion, two hundred thirty-one million, eight hundred sixty-one thousand, three hundred twenty-six".