2161905537 has 16 divisors (see below), whose sum is σ = 3145393152. Its totient is φ = 1309911120.

The previous prime is 2161905533. The next prime is 2161905541. The reversal of 2161905537 is 7355091612.

It is an interprime number because it is at equal distance from previous prime (2161905533) and next prime (2161905541).

It is not a de Polignac number, because 2161905537 - 2² = 2161905533 is a prime.

It is a super-2 number, since 2×2161905537² = 9347671101822516738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2161905495 and 2161905504.

It is not an unprimeable number, because it can be changed into a prime (2161905533) 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, 200908 + ... + 211394.

It is an arithmetic number, because the mean of its divisors is an integer number (196587072).

Almost surely, 2^2161905537 is an apocalyptic number.

It is an amenable number.

2161905537 is a deficient number, since it is larger than the sum of its proper divisors (983487615).

2161905537 is a wasteful number, since it uses less digits than its factorization.

2161905537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16748.

The product of its (nonzero) digits is 56700, while the sum is 39.

The square root of 2161905537 is about 46496.2959492474. The cubic root of 2161905537 is about 1293.0408277570.

The spelling of 2161905537 in words is "two billion, one hundred sixty-one million, nine hundred five thousand, five hundred thirty-seven".