1154542221 has 16 divisors (see below), whose sum is σ = 1954780800. Its totient is φ = 659738304.

The previous prime is 1154542219. The next prime is 1154542223. The reversal of 1154542221 is 1222454511.

It is a happy number.

1154542221 is a `hidden beast` number, since 115 + 4 + 542 + 2 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1154542219) and next prime (1154542223).

It is not a de Polignac number, because 1154542221 - 2¹ = 1154542219 is a prime.

It is a super-2 number, since 2×1154542221² = 2665935480143225682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1154542223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3054156 + ... + 3054533.

It is an arithmetic number, because the mean of its divisors is an integer number (122173800).

Almost surely, 2^1154542221 is an apocalyptic number.

It is an amenable number.

1154542221 is a deficient number, since it is larger than the sum of its proper divisors (800238579).

1154542221 is an equidigital number, since it uses as much as digits as its factorization.

1154542221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6108705 (or 6108699 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 1154542221 is about 33978.5553106662. Note that the first 3 decimals coincide. The cubic root of 1154542221 is about 1049.0671142685.

Adding to 1154542221 its reverse (1222454511), we get a palindrome (2376996732).

The spelling of 1154542221 in words is "one billion, one hundred fifty-four million, five hundred forty-two thousand, two hundred twenty-one".