1113437921 has 2 divisors, whose sum is σ = 1113437922. Its totient is φ = 1113437920.

The previous prime is 1113437903. The next prime is 1113437947. The reversal of 1113437921 is 1297343111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 799758400 + 313679521 = 28280^2 + 17711^2 .

It is an emirp because it is prime and its reverse (1297343111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1113437921 - 2¹⁰ = 1113436897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1113437821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 556718960 + 556718961.

It is an arithmetic number, because the mean of its divisors is an integer number (556718961).

Almost surely, 2^1113437921 is an apocalyptic number.

It is an amenable number.

1113437921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1113437921 is an equidigital number, since it uses as much as digits as its factorization.

1113437921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 32.

The square root of 1113437921 is about 33368.2172283747. The cubic root of 1113437921 is about 1036.4666584890.

The spelling of 1113437921 in words is "one billion, one hundred thirteen million, four hundred thirty-seven thousand, nine hundred twenty-one".