1155121451 has 8 divisors (see below), whose sum is σ = 1269753408. Its totient is φ = 1042093000.

The previous prime is 1155121447. The next prime is 1155121453. The reversal of 1155121451 is 1541215511.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1155121451 - 2² = 1155121447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1155121451.

It is not an unprimeable number, because it can be changed into a prime (1155121453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399365 + ... + 402246.

It is an arithmetic number, because the mean of its divisors is an integer number (158719176).

Almost surely, 2^1155121451 is an apocalyptic number.

1155121451 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1155121451 is a deficient number, since it is larger than the sum of its proper divisors (114631957).

1155121451 is a wasteful number, since it uses less digits than its factorization.

1155121451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801753.

The product of its digits is 1000, while the sum is 26.

The square root of 1155121451 is about 33987.0777060929. The cubic root of 1155121451 is about 1049.2425227675.

Adding to 1155121451 its reverse (1541215511), we get a palindrome (2696336962).

The spelling of 1155121451 in words is "one billion, one hundred fifty-five million, one hundred twenty-one thousand, four hundred fifty-one".