1231101443 has 16 divisors (see below), whose sum is σ = 1447337472. Its totient is φ = 1032372000.

The previous prime is 1231101397. The next prime is 1231101449. The reversal of 1231101443 is 3441011321.

It is not a de Polignac number, because 1231101443 - 2⁸ = 1231101187 is a prime.

It is a super-2 number, since 2×1231101443² = 3031221525913364498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231101449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 337238 + ... + 340868.

It is an arithmetic number, because the mean of its divisors is an integer number (90458592).

Almost surely, 2^1231101443 is an apocalyptic number.

1231101443 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1231101443 is a deficient number, since it is larger than the sum of its proper divisors (216236029).

1231101443 is a wasteful number, since it uses less digits than its factorization.

1231101443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6026.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1231101443 is about 35087.0552055883. The cubic root of 1231101443 is about 1071.7609931052.

Adding to 1231101443 its reverse (3441011321), we get a palindrome (4672112764).

The spelling of 1231101443 in words is "one billion, two hundred thirty-one million, one hundred one thousand, four hundred forty-three".