611638873 has 4 divisors (see below), whose sum is σ = 615534820. Its totient is φ = 607742928.

The previous prime is 611638847. The next prime is 611638877. The reversal of 611638873 is 378836116.

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 333683289 + 277955584 = 18267^2 + 16672^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-611638873 is a prime.

It is a super-2 number, since 2×611638873² = 748204221929420258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (611638877) 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, 1947738 + ... + 1948051.

It is an arithmetic number, because the mean of its divisors is an integer number (153883705).

Almost surely, 2^611638873 is an apocalyptic number.

It is an amenable number.

611638873 is a deficient number, since it is larger than the sum of its proper divisors (3895947).

611638873 is a wasteful number, since it uses less digits than its factorization.

611638873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3895946.

The product of its digits is 145152, while the sum is 43.

The square root of 611638873 is about 24731.3338297796. Note that the first 3 decimals coincide. The cubic root of 611638873 is about 848.8514466526.

The spelling of 611638873 in words is "six hundred eleven million, six hundred thirty-eight thousand, eight hundred seventy-three".