1157904221 has 6 divisors (see below), whose sum is σ = 1230023130. Its totient is φ = 1089791936.

The previous prime is 1157904211. The next prime is 1157904263. The reversal of 1157904221 is 1224097511.

It can be written as a sum of positive squares in 3 ways, for example, as 637562500 + 520341721 = 25250^2 + 22811^2 .

It is not a de Polignac number, because 1157904221 - 2¹⁴ = 1157887837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157904211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2003006 + ... + 2003583.

It is an arithmetic number, because the mean of its divisors is an integer number (205003855).

Almost surely, 2^1157904221 is an apocalyptic number.

It is an amenable number.

1157904221 is a deficient number, since it is larger than the sum of its proper divisors (72118909).

1157904221 is an equidigital number, since it uses as much as digits as its factorization.

1157904221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4006623 (or 4006606 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 1157904221 is about 34027.9917274000. The cubic root of 1157904221 is about 1050.0844137728.

The spelling of 1157904221 in words is "one billion, one hundred fifty-seven million, nine hundred four thousand, two hundred twenty-one".