2045560781 has 12 divisors (see below), whose sum is σ = 2273701500. Its totient is φ = 1838696640.

The previous prime is 2045560757. The next prime is 2045560801. The reversal of 2045560781 is 1870655402.

It can be written as a sum of positive squares in 2 ways, for example, as 312087556 + 1733473225 = 17666^2 + 41635^2 .

It is not a de Polignac number, because 2045560781 - 2¹⁰ = 2045559757 is a prime.

It is a super-2 number, since 2×2045560781² = 8368637817530659922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2045560711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84206 + ... + 105743.

It is an arithmetic number, because the mean of its divisors is an integer number (189475125).

Almost surely, 2^2045560781 is an apocalyptic number.

It is an amenable number.

2045560781 is a deficient number, since it is larger than the sum of its proper divisors (228140719).

2045560781 is a wasteful number, since it uses less digits than its factorization.

2045560781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190060 (or 190049 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 2045560781 is about 45227.8761495607. The cubic root of 2045560781 is about 1269.4164721672.

The spelling of 2045560781 in words is "two billion, forty-five million, five hundred sixty thousand, seven hundred eighty-one".