645052741 has 4 divisors (see below), whose sum is σ = 645145452. Its totient is φ = 644960032.

The previous prime is 645052739. The next prime is 645052753. The reversal of 645052741 is 147250546.

645052741 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 34468641 + 610584100 = 5871^2 + 24710^2 .

It is a cyclic number.

It is not a de Polignac number, because 645052741 - 2¹ = 645052739 is a prime.

It is a super-2 number, since 2×645052741² = 832186077343226162, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645052697 and 645052706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645052721) 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, 34990 + ... + 50143.

It is an arithmetic number, because the mean of its divisors is an integer number (161286363).

Almost surely, 2^645052741 is an apocalyptic number.

It is an amenable number.

645052741 is a deficient number, since it is larger than the sum of its proper divisors (92711).

645052741 is an equidigital number, since it uses as much as digits as its factorization.

645052741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92710.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 645052741 is about 25397.8885145990. Note that the first 3 decimals coincide. The cubic root of 645052741 is about 864.0358089332.

The spelling of 645052741 in words is "six hundred forty-five million, fifty-two thousand, seven hundred forty-one".