1123557901 has 2 divisors, whose sum is σ = 1123557902. Its totient is φ = 1123557900.

The previous prime is 1123557871. The next prime is 1123557917. The reversal of 1123557901 is 1097553211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1017673801 + 105884100 = 31901^2 + 10290^2 .

It is an emirp because it is prime and its reverse (1097553211) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123557901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123557101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561778950 + 561778951.

It is an arithmetic number, because the mean of its divisors is an integer number (561778951).

Almost surely, 2^1123557901 is an apocalyptic number.

It is an amenable number.

1123557901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123557901 is an equidigital number, since it uses as much as digits as its factorization.

1123557901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 34.

The square root of 1123557901 is about 33519.5152262081. The cubic root of 1123557901 is about 1039.5973234598.

The spelling of 1123557901 in words is "one billion, one hundred twenty-three million, five hundred fifty-seven thousand, nine hundred one".