645453041 has 4 divisors (see below), whose sum is σ = 645629952. Its totient is φ = 645276132.

The previous prime is 645453031. The next prime is 645453073. The reversal of 645453041 is 140354546.

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 a de Polignac number, because none of the positive numbers 2^k-645453041 is a prime.

It is a super-2 number, since 2×645453041² = 833219256272295362, 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 = 645452989 and 645453007.

It is not an unprimeable number, because it can be changed into a prime (645453031) 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, 82865 + ... + 90318.

It is an arithmetic number, because the mean of its divisors is an integer number (161407488).

Almost surely, 2^645453041 is an apocalyptic number.

It is an amenable number.

645453041 is a deficient number, since it is larger than the sum of its proper divisors (176911).

645453041 is a wasteful number, since it uses less digits than its factorization.

645453041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176910.

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 645453041 is about 25405.7678687341. The cubic root of 645453041 is about 864.2145033721.

It can be divided in two parts, 6454 and 53041, that added together give a palindrome (59495).

The spelling of 645453041 in words is "six hundred forty-five million, four hundred fifty-three thousand, forty-one".