2291249978 has 16 divisors (see below), whose sum is σ = 3515942760. Its totient is φ = 1119557376.

The previous prime is 2291249879. The next prime is 2291249999. The reversal of 2291249978 is 8799421922.

It can be written as a sum of positive squares in 4 ways, for example, as 2291249689 + 289 = 47867^2 + 17^2 .

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56075 + ... + 87902.

Almost surely, 2^2291249978 is an apocalyptic number.

2291249978 is a deficient number, since it is larger than the sum of its proper divisors (1224692782).

2291249978 is a wasteful number, since it uses less digits than its factorization.

2291249978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144161.

The product of its digits is 1306368, while the sum is 53.

The square root of 2291249978 is about 47867.0030187811. The cubic root of 2291249978 is about 1318.3300695464.

The spelling of 2291249978 in words is "two billion, two hundred ninety-one million, two hundred forty-nine thousand, nine hundred seventy-eight".