1121994521 has 2 divisors, whose sum is σ = 1121994522. Its totient is φ = 1121994520.

The previous prime is 1121994463. The next prime is 1121994541. The reversal of 1121994521 is 1254991211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 936054025 + 185940496 = 30595^2 + 13636^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121994521 - 2³⁰ = 48252697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121994541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560997260 + 560997261.

It is an arithmetic number, because the mean of its divisors is an integer number (560997261).

Almost surely, 2^1121994521 is an apocalyptic number.

It is an amenable number.

1121994521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121994521 is an equidigital number, since it uses as much as digits as its factorization.

1121994521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 35.

The square root of 1121994521 is about 33496.1866635592. The cubic root of 1121994521 is about 1039.1149154229.

The spelling of 1121994521 in words is "one billion, one hundred twenty-one million, nine hundred ninety-four thousand, five hundred twenty-one".