1233516989 has 16 divisors (see below), whose sum is σ = 1289931888. Its totient is φ = 1178468352.

The previous prime is 1233516983. The next prime is 1233517013. The reversal of 1233516989 is 9896153321.

It can be written as a sum of positive squares in 8 ways, for example, as 387696100 + 845820889 = 19690^2 + 29083^2 .

It is not a de Polignac number, because 1233516989 - 2¹² = 1233512893 is a prime.

It is a super-2 number, since 2×1233516989² = 3043128324303252242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1233516983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 693269 + ... + 695045.

It is an arithmetic number, because the mean of its divisors is an integer number (80620743).

Almost surely, 2^1233516989 is an apocalyptic number.

It is an amenable number.

1233516989 is a deficient number, since it is larger than the sum of its proper divisors (56414899).

1233516989 is a wasteful number, since it uses less digits than its factorization.

1233516989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144.

The product of its digits is 349920, while the sum is 47.

The square root of 1233516989 is about 35121.4605191755. The cubic root of 1233516989 is about 1072.4615031018.

The spelling of 1233516989 in words is "one billion, two hundred thirty-three million, five hundred sixteen thousand, nine hundred eighty-nine".