2261374978 has 4 divisors (see below), whose sum is σ = 3392062470. Its totient is φ = 1130687488.

The previous prime is 2261374933. The next prime is 2261374979. The reversal of 2261374978 is 8794731622.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8794731622 = 2 ⋅4397365811.

It can be written as a sum of positive squares in only one way, i.e., 1231799409 + 1029575569 = 35097^2 + 32087^2 .

It is a super-2 number, since 2×2261374978² = 10227633582249000968, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2261374979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565343743 + ... + 565343746.

Almost surely, 2^2261374978 is an apocalyptic number.

2261374978 is a deficient number, since it is larger than the sum of its proper divisors (1130687492).

2261374978 is a wasteful number, since it uses less digits than its factorization.

2261374978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130687491.

The product of its digits is 1016064, while the sum is 49.

The square root of 2261374978 is about 47553.9165369163. The cubic root of 2261374978 is about 1312.5751992953.

The spelling of 2261374978 in words is "two billion, two hundred sixty-one million, three hundred seventy-four thousand, nine hundred seventy-eight".