641455 has 4 divisors (see below), whose sum is σ = 769752. Its totient is φ = 513160.

The previous prime is 641453. The next prime is 641467. The reversal of 641455 is 554146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 554146 = 2 ⋅277073.

It is not a de Polignac number, because 641455 - 2¹ = 641453 is a prime.

It is a super-2 number, since 2×641455² = 822929034050, which contains 22 as substring.

It is a Duffinian number.

641455 is a lucky number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 64141 + ... + 64150.

It is an arithmetic number, because the mean of its divisors is an integer number (192438).

2⁶⁴¹⁴⁵⁵ is an apocalyptic number.

641455 is a deficient number, since it is larger than the sum of its proper divisors (128297).

641455 is a wasteful number, since it uses less digits than its factorization.

641455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128296.

The product of its digits is 2400, while the sum is 25.

The square root of 641455 is about 800.9088587349. The cubic root of 641455 is about 86.2426444753.

The spelling of 641455 in words is "six hundred forty-one thousand, four hundred fifty-five".