1157726221 has 8 divisors (see below), whose sum is σ = 1219216320. Its totient is φ = 1096291872.

The previous prime is 1157726153. The next prime is 1157726233. The reversal of 1157726221 is 1226277511.

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 1157726221 - 2¹¹ = 1157724173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157726621) 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, 32736 + ... + 58198.

It is an arithmetic number, because the mean of its divisors is an integer number (152402040).

Almost surely, 2^1157726221 is an apocalyptic number.

It is an amenable number.

1157726221 is a deficient number, since it is larger than the sum of its proper divisors (61490099).

1157726221 is a wasteful number, since it uses less digits than its factorization.

1157726221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27875.

The product of its digits is 11760, while the sum is 34.

The square root of 1157726221 is about 34025.3761331157. The cubic root of 1157726221 is about 1050.0306025850.

The spelling of 1157726221 in words is "one billion, one hundred fifty-seven million, seven hundred twenty-six thousand, two hundred twenty-one".