657481 has 4 divisors (see below), whose sum is σ = 717264. Its totient is φ = 597700.

The previous prime is 657473. The next prime is 657491. The reversal of 657481 is 184756.

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 a cyclic number.

It is not a de Polignac number, because 657481 - 2³ = 657473 is a prime.

It is a super-2 number, since 2×657481² = 864562530722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

657481 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (657431) 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, 29875 + ... + 29896.

It is an arithmetic number, because the mean of its divisors is an integer number (179316).

2⁶⁵⁷⁴⁸¹ is an apocalyptic number.

It is an amenable number.

657481 is a deficient number, since it is larger than the sum of its proper divisors (59783).

657481 is a wasteful number, since it uses less digits than its factorization.

657481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59782.

The product of its digits is 6720, while the sum is 31.

The square root of 657481 is about 810.8520210248. The cubic root of 657481 is about 86.9549685483.

The spelling of 657481 in words is "six hundred fifty-seven thousand, four hundred eighty-one".