651242243 has 4 divisors (see below), whose sum is σ = 657690288. Its totient is φ = 644794200.

The previous prime is 651242231. The next prime is 651242279. The reversal of 651242243 is 342242156.

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

It is a cyclic number.

It is not a de Polignac number, because 651242243 - 2¹⁴ = 651225859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651442243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3223871 + ... + 3224072.

It is an arithmetic number, because the mean of its divisors is an integer number (164422572).

Almost surely, 2^651242243 is an apocalyptic number.

651242243 is a deficient number, since it is larger than the sum of its proper divisors (6448045).

651242243 is a wasteful number, since it uses less digits than its factorization.

651242243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6448044.

The product of its digits is 11520, while the sum is 29.

The square root of 651242243 is about 25519.4483286767. The cubic root of 651242243 is about 866.7905897911.

Adding to 651242243 its reverse (342242156), we get a palindrome (993484399).

The spelling of 651242243 in words is "six hundred fifty-one million, two hundred forty-two thousand, two hundred forty-three".