1151105821 has 2 divisors, whose sum is σ = 1151105822. Its totient is φ = 1151105820.

The previous prime is 1151105759. The next prime is 1151105897. The reversal of 1151105821 is 1285011511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 887205796 + 263900025 = 29786^2 + 16245^2 .

It is a cyclic number.

It is not a de Polignac number, because 1151105821 - 2¹¹ = 1151103773 is a prime.

It is a super-2 number, since 2×1151105821² = 2650089222280168082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1151109821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 575552910 + 575552911.

It is an arithmetic number, because the mean of its divisors is an integer number (575552911).

Almost surely, 2^1151105821 is an apocalyptic number.

It is an amenable number.

1151105821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1151105821 is an equidigital number, since it uses as much as digits as its factorization.

1151105821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 25.

The square root of 1151105821 is about 33927.9504391291. The cubic root of 1151105821 is about 1048.0252592464.

The spelling of 1151105821 in words is "one billion, one hundred fifty-one million, one hundred five thousand, eight hundred twenty-one".