2161951370 has 16 divisors (see below), whose sum is σ = 4120425288. Its totient is φ = 813911040.

The previous prime is 2161951343. The next prime is 2161951397. The reversal of 2161951370 is 731591612.

It is an interprime number because it is at equal distance from previous prime (2161951343) and next prime (2161951397).

It can be written as a sum of positive squares in 4 ways, for example, as 2157695401 + 4255969 = 46451^2 + 2063^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2161951370.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6358511 + ... + 6358850.

Almost surely, 2^2161951370 is an apocalyptic number.

2161951370 is a deficient number, since it is larger than the sum of its proper divisors (1958473918).

2161951370 is a wasteful number, since it uses less digits than its factorization.

2161951370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12717385.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 2161951370 is about 46496.7888138525. The cubic root of 2161951370 is about 1293.0499653011.

The spelling of 2161951370 in words is "two billion, one hundred sixty-one million, nine hundred fifty-one thousand, three hundred seventy".