1945112681 has 8 divisors (see below), whose sum is σ = 2115194760. Its totient is φ = 1781215488.

The previous prime is 1945112671. The next prime is 1945112713. The reversal of 1945112681 is 1862115491.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 714225625 + 1230887056 = 26725^2 + 35084^2 .

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 1945112681 - 2¹⁰ = 1945111657 is a prime.

It is a super-2 number, since 2×1945112681² = 7566926683574015522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1945112651) 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, 1545566 + ... + 1546823.

It is an arithmetic number, because the mean of its divisors is an integer number (264399345).

Almost surely, 2^1945112681 is an apocalyptic number.

It is an amenable number.

1945112681 is a deficient number, since it is larger than the sum of its proper divisors (170082079).

1945112681 is a wasteful number, since it uses less digits than its factorization.

1945112681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3092443.

The product of its digits is 17280, while the sum is 38.

The square root of 1945112681 is about 44103.4316238544. The cubic root of 1945112681 is about 1248.2883625877.

The spelling of 1945112681 in words is "one billion, nine hundred forty-five million, one hundred twelve thousand, six hundred eighty-one".