1154223251 has 4 divisors (see below), whose sum is σ = 1185418512. Its totient is φ = 1123027992.

The previous prime is 1154223233. The next prime is 1154223281. The reversal of 1154223251 is 1523224511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1154223251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1154223251.

It is not an unprimeable number, because it can be changed into a prime (1154223281) 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, 15597575 + ... + 15597648.

It is an arithmetic number, because the mean of its divisors is an integer number (296354628).

Almost surely, 2^1154223251 is an apocalyptic number.

1154223251 is a deficient number, since it is larger than the sum of its proper divisors (31195261).

1154223251 is an equidigital number, since it uses as much as digits as its factorization.

1154223251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31195260.

The product of its digits is 2400, while the sum is 26.

The square root of 1154223251 is about 33973.8612907041. The cubic root of 1154223251 is about 1048.9704953802.

Adding to 1154223251 its reverse (1523224511), we get a palindrome (2677447762).

The spelling of 1154223251 in words is "one billion, one hundred fifty-four million, two hundred twenty-three thousand, two hundred fifty-one".