1145121451 has 4 divisors (see below), whose sum is σ = 1145252304. Its totient is φ = 1144990600.

The previous prime is 1145121407. The next prime is 1145121491. The reversal of 1145121451 is 1541215411.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1145121451 - 2⁷ = 1145121323 is a prime.

It is a super-2 number, since 2×1145121451² = 2622606275080690802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1145121491) 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, 51280 + ... + 70141.

It is an arithmetic number, because the mean of its divisors is an integer number (286313076).

Almost surely, 2^1145121451 is an apocalyptic number.

1145121451 is a deficient number, since it is larger than the sum of its proper divisors (130853).

1145121451 is an equidigital number, since it uses as much as digits as its factorization.

1145121451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130852.

The product of its digits is 800, while the sum is 25.

The square root of 1145121451 is about 33839.6431866531. The cubic root of 1145121451 is about 1046.2059446161.

Adding to 1145121451 its reverse (1541215411), we get a palindrome (2686336862).

The spelling of 1145121451 in words is "one billion, one hundred forty-five million, one hundred twenty-one thousand, four hundred fifty-one".