1154221541 has 12 divisors (see below), whose sum is σ = 1273986252. Its totient is φ = 1044912000.

The previous prime is 1154221499. The next prime is 1154221553. The reversal of 1154221541 is 1451224511.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 826792516 + 327429025 = 28754^2 + 18095^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1154221541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1154221541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1154221561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9371 + ... + 48951.

It is an arithmetic number, because the mean of its divisors is an integer number (106165521).

Almost surely, 2^1154221541 is an apocalyptic number.

1154221541 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1154221541 is a deficient number, since it is larger than the sum of its proper divisors (119764711).

1154221541 is a wasteful number, since it uses less digits than its factorization.

1154221541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39844 (or 39833 counting only the distinct ones).

The product of its digits is 1600, while the sum is 26.

The square root of 1154221541 is about 33973.8361242883. The cubic root of 1154221541 is about 1048.9699773578.

The spelling of 1154221541 in words is "one billion, one hundred fifty-four million, two hundred twenty-one thousand, five hundred forty-one".