1231456191 has 12 divisors (see below), whose sum is σ = 1910013912. Its totient is φ = 703689168.

The previous prime is 1231456153. The next prime is 1231456223. The reversal of 1231456191 is 1916541321.

It is not a de Polignac number, because 1231456191 - 2¹⁵ = 1231423423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231456111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4188480 + ... + 4188773.

It is an arithmetic number, because the mean of its divisors is an integer number (159167826).

Almost surely, 2^1231456191 is an apocalyptic number.

1231456191 is a deficient number, since it is larger than the sum of its proper divisors (678557721).

1231456191 is an equidigital number, since it uses as much as digits as its factorization.

1231456191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8377270 (or 8377263 counting only the distinct ones).

The product of its digits is 6480, while the sum is 33.

The square root of 1231456191 is about 35092.1100961455. The cubic root of 1231456191 is about 1071.8639276379.

The spelling of 1231456191 in words is "one billion, two hundred thirty-one million, four hundred fifty-six thousand, one hundred ninety-one".