4997261861 has 4 divisors (see below), whose sum is σ = 5013026412. Its totient is φ = 4981497312.

The previous prime is 4997261849. The next prime is 4997261869. The reversal of 4997261861 is 1681627994.

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 265885636 + 4731376225 = 16306^2 + 68785^2 .

It is a cyclic number.

It is not a de Polignac number, because 4997261861 - 2¹⁰ = 4997260837 is a prime.

It is a super-2 number, since 2×4997261861² = 49945252214810366642, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4997261869) 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, 7881800 + ... + 7882433.

It is an arithmetic number, because the mean of its divisors is an integer number (1253256603).

Almost surely, 2^4997261861 is an apocalyptic number.

It is an amenable number.

4997261861 is a deficient number, since it is larger than the sum of its proper divisors (15764551).

4997261861 is a wasteful number, since it uses less digits than its factorization.

4997261861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15764550.

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

The square root of 4997261861 is about 70691.3139006484. The cubic root of 4997261861 is about 1709.6637462246.

The spelling of 4997261861 in words is "four billion, nine hundred ninety-seven million, two hundred sixty-one thousand, eight hundred sixty-one".