2897394781 has 4 divisors (see below), whose sum is σ = 2898410364. Its totient is φ = 2896379200.

The previous prime is 2897394769. The next prime is 2897394817. The reversal of 2897394781 is 1874937982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 663320025 + 2234074756 = 25755^2 + 47266^2 .

It is a cyclic number.

It is not a de Polignac number, because 2897394781 - 2²³ = 2889006173 is a prime.

It is a super-2 number, since 2×2897394781² = 16789793033932075922, 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 (2897394751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503500 + ... + 509221.

It is an arithmetic number, because the mean of its divisors is an integer number (724602591).

Almost surely, 2^2897394781 is an apocalyptic number.

It is an amenable number.

2897394781 is a deficient number, since it is larger than the sum of its proper divisors (1015583).

2897394781 is a wasteful number, since it uses less digits than its factorization.

2897394781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015582.

The product of its digits is 6096384, while the sum is 58.

The square root of 2897394781 is about 53827.4537852200. The cubic root of 2897394781 is about 1425.6159899284.

The spelling of 2897394781 in words is "two billion, eight hundred ninety-seven million, three hundred ninety-four thousand, seven hundred eighty-one".