649172841 has 4 divisors (see below), whose sum is σ = 865563792. Its totient is φ = 432781892.

The previous prime is 649172759. The next prime is 649172857. The reversal of 649172841 is 148271946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 649172841 - 2¹¹ = 649170793 is a prime.

It is a super-2 number, since 2×649172841² = 842850754984022562, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 649172793 and 649172802.

It is not an unprimeable number, because it can be changed into a prime (649172341) 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, 108195471 + ... + 108195476.

It is an arithmetic number, because the mean of its divisors is an integer number (216390948).

Almost surely, 2^649172841 is an apocalyptic number.

It is an amenable number.

649172841 is a deficient number, since it is larger than the sum of its proper divisors (216390951).

649172841 is a wasteful number, since it uses less digits than its factorization.

649172841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216390950.

The product of its digits is 96768, while the sum is 42.

The square root of 649172841 is about 25478.8704812439. The cubic root of 649172841 is about 865.8715045088.

The spelling of 649172841 in words is "six hundred forty-nine million, one hundred seventy-two thousand, eight hundred forty-one".