685748501 has 4 divisors (see below), whose sum is σ = 686786604. Its totient is φ = 684710400.

The previous prime is 685748467. The next prime is 685748507. The reversal of 685748501 is 105847586.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 438944401 + 246804100 = 20951^2 + 15710^2 .

It is a cyclic number.

It is not a de Polignac number, because 685748501 - 2¹⁰ = 685747477 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 (685748507) 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, 518060 + ... + 519381.

It is an arithmetic number, because the mean of its divisors is an integer number (171696651).

Almost surely, 2^685748501 is an apocalyptic number.

It is an amenable number.

685748501 is a deficient number, since it is larger than the sum of its proper divisors (1038103).

685748501 is a wasteful number, since it uses less digits than its factorization.

685748501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038102.

The product of its (nonzero) digits is 268800, while the sum is 44.

The square root of 685748501 is about 26186.8001290727. The cubic root of 685748501 is about 881.8369432206.

The spelling of 685748501 in words is "six hundred eighty-five million, seven hundred forty-eight thousand, five hundred one".