1145554231 has 4 divisors (see below), whose sum is σ = 1212939792. Its totient is φ = 1078168672.

The previous prime is 1145554187. The next prime is 1145554247. The reversal of 1145554231 is 1324555411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1324555411 = 8737 ⋅151603.

It is a cyclic number.

It is not a de Polignac number, because 1145554231 - 2⁷ = 1145554103 is a prime.

It is a super-2 number, since 2×1145554231² = 2624588992324002722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1145554193 and 1145554202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145554831) 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, 33692755 + ... + 33692788.

It is an arithmetic number, because the mean of its divisors is an integer number (303234948).

Almost surely, 2^1145554231 is an apocalyptic number.

1145554231 is a deficient number, since it is larger than the sum of its proper divisors (67385561).

1145554231 is an equidigital number, since it uses as much as digits as its factorization.

1145554231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67385560.

The product of its digits is 12000, while the sum is 31.

The square root of 1145554231 is about 33846.0371535576. The cubic root of 1145554231 is about 1046.3377268477.

The spelling of 1145554231 in words is "one billion, one hundred forty-five million, five hundred fifty-four thousand, two hundred thirty-one".