2045969881 has 8 divisors (see below), whose sum is σ = 2078500424. Its totient is φ = 2013672960.

The previous prime is 2045969857. The next prime is 2045969903. The reversal of 2045969881 is 1889695402.

It can be written as a sum of positive squares in 4 ways, for example, as 33640000 + 2012329881 = 5800^2 + 44859^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2045969881 - 2⁷ = 2045969753 is a prime.

It is a super-2 number, since 2×2045969881² = 8371985507918308322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2045969281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40710 + ... + 75823.

It is an arithmetic number, because the mean of its divisors is an integer number (259812553).

Almost surely, 2^2045969881 is an apocalyptic number.

It is an amenable number.

2045969881 is a deficient number, since it is larger than the sum of its proper divisors (32530543).

2045969881 is a wasteful number, since it uses less digits than its factorization.

2045969881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116811.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The square root of 2045969881 is about 45232.3985766839. The cubic root of 2045969881 is about 1269.5010917766.

The spelling of 2045969881 in words is "two billion, forty-five million, nine hundred sixty-nine thousand, eight hundred eighty-one".