1155625221 has 16 divisors (see below), whose sum is σ = 1579697280. Its totient is φ = 751015680.

The previous prime is 1155625199. The next prime is 1155625241. The reversal of 1155625221 is 1225265511.

It is not a de Polignac number, because 1155625221 - 2⁶ = 1155625157 is a prime.

It is a super-2 number, since 2×1155625221² = 2670939302822597682, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155625241) 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, 186745 + ... + 192833.

It is an arithmetic number, because the mean of its divisors is an integer number (98731080).

Almost surely, 2^1155625221 is an apocalyptic number.

It is an amenable number.

1155625221 is a deficient number, since it is larger than the sum of its proper divisors (424072059).

1155625221 is a wasteful number, since it uses less digits than its factorization.

1155625221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7676.

The product of its digits is 6000, while the sum is 30.

The square root of 1155625221 is about 33994.4880973372. The cubic root of 1155625221 is about 1049.3950320075.

The spelling of 1155625221 in words is "one billion, one hundred fifty-five million, six hundred twenty-five thousand, two hundred twenty-one".