651818941 has 4 divisors (see below), whose sum is σ = 655970812. Its totient is φ = 647667072.

The previous prime is 651818939. The next prime is 651818957. The reversal of 651818941 is 149818156.

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 167598916 + 484220025 = 12946^2 + 22005^2 .

It is a cyclic number.

It is not a de Polignac number, because 651818941 - 2¹ = 651818939 is a prime.

It is a super-2 number, since 2×651818941² = 849735863692722962, 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 (652818941) 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, 2075700 + ... + 2076013.

It is an arithmetic number, because the mean of its divisors is an integer number (163992703).

Almost surely, 2^651818941 is an apocalyptic number.

It is an amenable number.

651818941 is a deficient number, since it is larger than the sum of its proper divisors (4151871).

651818941 is a wasteful number, since it uses less digits than its factorization.

651818941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4151870.

The product of its digits is 69120, while the sum is 43.

The square root of 651818941 is about 25530.7450145898. The cubic root of 651818941 is about 867.0463721950.

The spelling of 651818941 in words is "six hundred fifty-one million, eight hundred eighteen thousand, nine hundred forty-one".