651239423 has 4 divisors (see below), whose sum is σ = 659483040. Its totient is φ = 642995808.

The previous prime is 651239401. The next prime is 651239437. The reversal of 651239423 is 324932156.

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 651239423 - 2¹⁴ = 651223039 is a prime.

It is a super-2 number, since 2×651239423² = 848225572138745858, 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 (651239443) 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, 4121690 + ... + 4121847.

It is an arithmetic number, because the mean of its divisors is an integer number (164870760).

Almost surely, 2^651239423 is an apocalyptic number.

651239423 is a deficient number, since it is larger than the sum of its proper divisors (8243617).

651239423 is an equidigital number, since it uses as much as digits as its factorization.

651239423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8243616.

The product of its digits is 38880, while the sum is 35.

The square root of 651239423 is about 25519.3930766388. The cubic root of 651239423 is about 866.7893386678.

The spelling of 651239423 in words is "six hundred fifty-one million, two hundred thirty-nine thousand, four hundred twenty-three".