2097157509 has 24 divisors (see below), whose sum is σ = 3193573760. Its totient is φ = 1322479872.

The previous prime is 2097157507. The next prime is 2097157541. The reversal of 2097157509 is 9057517902.

2097157509 is a `hidden beast` number, since 2 + 0 + 9 + 71 + 575 + 0 + 9 = 666.

It is not a de Polignac number, because 2097157509 - 2¹ = 2097157507 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2097157501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105972 + ... + 124194.

Almost surely, 2^2097157509 is an apocalyptic number.

It is an amenable number.

2097157509 is a deficient number, since it is larger than the sum of its proper divisors (1096416251).

2097157509 is a wasteful number, since it uses less digits than its factorization.

2097157509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18921 (or 18918 counting only the distinct ones).

The product of its (nonzero) digits is 198450, while the sum is 45.

The square root of 2097157509 is about 45794.7323280746. The cubic root of 2097157509 is about 1280.0011208079.

The spelling of 2097157509 in words is "two billion, ninety-seven million, one hundred fifty-seven thousand, five hundred nine".