651912749 has 4 divisors (see below), whose sum is σ = 651968064. Its totient is φ = 651857436.

The previous prime is 651912739. The next prime is 651912761. The reversal of 651912749 is 947219156.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 651912749 - 2⁸ = 651912493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651912739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2117 + ... + 36170.

It is an arithmetic number, because the mean of its divisors is an integer number (162992016).

Almost surely, 2^651912749 is an apocalyptic number.

It is an amenable number.

651912749 is a deficient number, since it is larger than the sum of its proper divisors (55315).

651912749 is a wasteful number, since it uses less digits than its factorization.

651912749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55314.

The product of its digits is 136080, while the sum is 44.

The square root of 651912749 is about 25532.5821060072. The cubic root of 651912749 is about 867.0879645143.

The spelling of 651912749 in words is "six hundred fifty-one million, nine hundred twelve thousand, seven hundred forty-nine".