1231000080 has 80 divisors (see below), whose sum is σ = 3939224064. Its totient is φ = 317675520.

The previous prime is 1231000061. The next prime is 1231000081. The reversal of 1231000080 is 800001321.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1231000080² = 3030722393920012800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (1231000081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75289 + ... + 90168.

Almost surely, 2^1231000080 is an apocalyptic number.

1231000080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231000080 is an abundant number, since it is smaller than the sum of its proper divisors (2708223984).

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

1231000080 is a wasteful number, since it uses less digits than its factorization.

1231000080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165504 (or 165498 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1231000080 is about 35085.6107257662. The cubic root of 1231000080 is about 1071.7315777412.

The spelling of 1231000080 in words is "one billion, two hundred thirty-one million, eighty", and thus it is an aban number.