1155425221 has 8 divisors (see below), whose sum is σ = 1195682400. Its totient is φ = 1115195760.

The previous prime is 1155425197. The next prime is 1155425237. The reversal of 1155425221 is 1225245511.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155425221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1155425221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155425021) 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, 113770 + ... + 123508.

It is an arithmetic number, because the mean of its divisors is an integer number (149460300).

Almost surely, 2^1155425221 is an apocalyptic number.

It is an amenable number.

1155425221 is a deficient number, since it is larger than the sum of its proper divisors (40257179).

1155425221 is an equidigital number, since it uses as much as digits as its factorization.

1155425221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13859.

The product of its digits is 4000, while the sum is 28.

The square root of 1155425221 is about 33991.5463166947. The cubic root of 1155425221 is about 1049.3344901434.

The spelling of 1155425221 in words is "one billion, one hundred fifty-five million, four hundred twenty-five thousand, two hundred twenty-one".