1121953817 has 2 divisors, whose sum is σ = 1121953818. Its totient is φ = 1121953816.

The previous prime is 1121953801. The next prime is 1121953831. The reversal of 1121953817 is 7183591211.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 631818496 + 490135321 = 25136^2 + 22139^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121953817 - 2⁴ = 1121953801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121953837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560976908 + 560976909.

It is an arithmetic number, because the mean of its divisors is an integer number (560976909).

Almost surely, 2^1121953817 is an apocalyptic number.

It is an amenable number.

1121953817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121953817 is an equidigital number, since it uses as much as digits as its factorization.

1121953817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 38.

The square root of 1121953817 is about 33495.5790664977. The cubic root of 1121953817 is about 1039.1023495134.

The spelling of 1121953817 in words is "one billion, one hundred twenty-one million, nine hundred fifty-three thousand, eight hundred seventeen".