2135897991 has 10 divisors (see below), whose sum is σ = 3190662552. Its totient is φ = 1423931940.

The previous prime is 2135897987. The next prime is 2135898007. The reversal of 2135897991 is 1997985312.

It is not a de Polignac number, because 2135897991 - 2² = 2135897987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2135895991) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13184475 + ... + 13184636.

Almost surely, 2^2135897991 is an apocalyptic number.

2135897991 is a deficient number, since it is larger than the sum of its proper divisors (1054764561).

2135897991 is an equidigital number, since it uses as much as digits as its factorization.

2135897991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26369123 (or 26369114 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 2135897991 is about 46215.7764296998. The cubic root of 2135897991 is about 1287.8348374226.

The spelling of 2135897991 in words is "two billion, one hundred thirty-five million, eight hundred ninety-seven thousand, nine hundred ninety-one".