1235116621 has 2 divisors, whose sum is σ = 1235116622. Its totient is φ = 1235116620.

The previous prime is 1235116613. The next prime is 1235116633. The reversal of 1235116621 is 1266115321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1106294121 + 128822500 = 33261^2 + 11350^2 .

It is a cyclic number.

It is not a de Polignac number, because 1235116621 - 2³ = 1235116613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1235116621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1235116651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617558310 + 617558311.

It is an arithmetic number, because the mean of its divisors is an integer number (617558311).

Almost surely, 2^1235116621 is an apocalyptic number.

It is an amenable number.

1235116621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1235116621 is an equidigital number, since it uses as much as digits as its factorization.

1235116621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 28.

The square root of 1235116621 is about 35144.2259980214. The cubic root of 1235116621 is about 1072.9248942867.

The spelling of 1235116621 in words is "one billion, two hundred thirty-five million, one hundred sixteen thousand, six hundred twenty-one".