648651719 has 4 divisors (see below), whose sum is σ = 669576000. Its totient is φ = 627727440.

The previous prime is 648651649. The next prime is 648651721. The reversal of 648651719 is 917156846.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648651719 is a prime.

It is a super-2 number, since 2×648651719² = 841498105123309922, 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 (648651739) 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, 10462094 + ... + 10462155.

It is an arithmetic number, because the mean of its divisors is an integer number (167394000).

Almost surely, 2^648651719 is an apocalyptic number.

648651719 is a deficient number, since it is larger than the sum of its proper divisors (20924281).

648651719 is a wasteful number, since it uses less digits than its factorization.

648651719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20924280.

The product of its digits is 362880, while the sum is 47.

The square root of 648651719 is about 25468.6418758441. The cubic root of 648651719 is about 865.6397503671.

The spelling of 648651719 in words is "six hundred forty-eight million, six hundred fifty-one thousand, seven hundred nineteen".