645127 has 8 divisors (see below), whose sum is σ = 769536. Its totient is φ = 528792.

The previous prime is 645097. The next prime is 645131. The reversal of 645127 is 721546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645127 - 2⁷ = 644999 is a prime.

It is a super-2 number, since 2×645127² = 832377692258, which contains 22 as substring.

It is a Duffinian number.

645127 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1843 + ... + 2164.

It is an arithmetic number, because the mean of its divisors is an integer number (96192).

2⁶⁴⁵¹²⁷ is an apocalyptic number.

645127 is a deficient number, since it is larger than the sum of its proper divisors (124409).

645127 is a wasteful number, since it uses less digits than its factorization.

645127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4037.

The product of its digits is 1680, while the sum is 25.

The square root of 645127 is about 803.1979830652. The cubic root of 645127 is about 86.4068963831.

It can be divided in two parts, 64512 and 7, that multiplied together give a square (451584 = 672²).

The spelling of 645127 in words is "six hundred forty-five thousand, one hundred twenty-seven".