641457 has 12 divisors (see below), whose sum is σ = 933504. Its totient is φ = 424440.

The previous prime is 641453. The next prime is 641467. The reversal of 641457 is 754146.

641457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 641457 - 2² = 641453 is a prime.

It is a super-2 number, since 2×641457² = 822934165698, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

641457 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 641457.

It is not an unprimeable number, because it can be changed into a prime (641453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2232 + ... + 2502.

It is an arithmetic number, because the mean of its divisors is an integer number (77792).

2⁶⁴¹⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

641457 is a deficient number, since it is larger than the sum of its proper divisors (292047).

641457 is a wasteful number, since it uses less digits than its factorization.

641457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540 (or 537 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 641457 is about 800.9101073154. The cubic root of 641457 is about 86.2427341075.

It can be divided in two parts, 64 and 1457, that added together give a square (1521 = 39²).

The spelling of 641457 in words is "six hundred forty-one thousand, four hundred fifty-seven".