1231871073 has 4 divisors (see below), whose sum is σ = 1642494768. Its totient is φ = 821247380.

The previous prime is 1231871063. The next prime is 1231871083. The reversal of 1231871073 is 3701781321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1231871063) and next prime (1231871083).

It is a cyclic number.

It is not a de Polignac number, because 1231871073 - 2⁴ = 1231871057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231871063) 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, 205311843 + ... + 205311848.

It is an arithmetic number, because the mean of its divisors is an integer number (410623692).

Almost surely, 2^1231871073 is an apocalyptic number.

It is an amenable number.

1231871073 is a deficient number, since it is larger than the sum of its proper divisors (410623695).

1231871073 is an equidigital number, since it uses as much as digits as its factorization.

1231871073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410623694.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 1231871073 is about 35098.0209271121. The cubic root of 1231871073 is about 1071.9842857210.

The spelling of 1231871073 in words is "one billion, two hundred thirty-one million, eight hundred seventy-one thousand, seventy-three".