648957 has 4 divisors (see below), whose sum is σ = 865280. Its totient is φ = 432636.

The previous prime is 648953. The next prime is 648961. The reversal of 648957 is 759846.

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.

It is an interprime number because it is at equal distance from previous prime (648953) and next prime (648961).

It is not a de Polignac number, because 648957 - 2² = 648953 is a prime.

It is a super-2 number, since 2×648957² = 842290375698, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 648957.

It is not an unprimeable number, because it can be changed into a prime (648953) 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, 108157 + ... + 108162.

It is an arithmetic number, because the mean of its divisors is an integer number (216320).

2⁶⁴⁸⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

648957 is a deficient number, since it is larger than the sum of its proper divisors (216323).

648957 is a wasteful number, since it uses less digits than its factorization.

648957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216322.

The product of its digits is 60480, while the sum is 39.

The square root of 648957 is about 805.5786739978. The cubic root of 648957 is about 86.5775530434.

Subtracting 648957 from its reverse (759846), we obtain a square (110889 = 333²).

The spelling of 648957 in words is "six hundred forty-eight thousand, nine hundred fifty-seven".