1121720837 has 2 divisors, whose sum is σ = 1121720838. Its totient is φ = 1121720836.

The previous prime is 1121720813. The next prime is 1121720851. The reversal of 1121720837 is 7380271211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 988410721 + 133310116 = 31439^2 + 11546^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121720837 - 2⁶ = 1121720773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121720857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560860418 + 560860419.

It is an arithmetic number, because the mean of its divisors is an integer number (560860419).

Almost surely, 2^1121720837 is an apocalyptic number.

It is an amenable number.

1121720837 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121720837 is an equidigital number, since it uses as much as digits as its factorization.

1121720837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 1121720837 is about 33492.1011135462. The cubic root of 1121720837 is about 1039.0304193915.

The spelling of 1121720837 in words is "one billion, one hundred twenty-one million, seven hundred twenty thousand, eight hundred thirty-seven".