2161901417 has 4 divisors (see below), whose sum is σ = 2328201540. Its totient is φ = 1995601296.

The previous prime is 2161901393. The next prime is 2161901419. The reversal of 2161901417 is 7141091612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1026817936 + 1135083481 = 32044^2 + 33691^2 .

It is not a de Polignac number, because 2161901417 - 2¹⁸ = 2161639273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161901419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83150042 + ... + 83150067.

It is an arithmetic number, because the mean of its divisors is an integer number (582050385).

Almost surely, 2^2161901417 is an apocalyptic number.

It is an amenable number.

2161901417 is a deficient number, since it is larger than the sum of its proper divisors (166300123).

2161901417 is a wasteful number, since it uses less digits than its factorization.

2161901417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166300122.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 2161901417 is about 46496.2516446218. The cubic root of 2161901417 is about 1293.0400063625.

The spelling of 2161901417 in words is "two billion, one hundred sixty-one million, nine hundred one thousand, four hundred seventeen".