1131400231 has 4 divisors (see below), whose sum is σ = 1218431032. Its totient is φ = 1044369432.

The previous prime is 1131400223. The next prime is 1131400241. The reversal of 1131400231 is 1320041311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1320041311 = 26501 ⋅49811.

It is a cyclic number.

It is not a de Polignac number, because 1131400231 - 2³ = 1131400223 is a prime.

It is a super-2 number, since 2×1131400231² = 2560132965413706722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131400241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43515381 + ... + 43515406.

It is an arithmetic number, because the mean of its divisors is an integer number (304607758).

Almost surely, 2^1131400231 is an apocalyptic number.

1131400231 is a deficient number, since it is larger than the sum of its proper divisors (87030801).

1131400231 is an equidigital number, since it uses as much as digits as its factorization.

1131400231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87030800.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1131400231 is about 33636.2933600003. The cubic root of 1131400231 is about 1042.0104819146.

Adding to 1131400231 its reverse (1320041311), we get a palindrome (2451441542).

The spelling of 1131400231 in words is "one billion, one hundred thirty-one million, four hundred thousand, two hundred thirty-one".