645601301 has 2 divisors, whose sum is σ = 645601302. Its totient is φ = 645601300.

The previous prime is 645601189. The next prime is 645601303. The reversal of 645601301 is 103106546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 552015025 + 93586276 = 23495^2 + 9674^2 .

It is a cyclic number.

It is not a de Polignac number, because 645601301 - 2²⁶ = 578492437 is a prime.

Together with 645601303, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645601303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322800650 + 322800651.

It is an arithmetic number, because the mean of its divisors is an integer number (322800651).

Almost surely, 2^645601301 is an apocalyptic number.

It is an amenable number.

645601301 is a deficient number, since it is larger than the sum of its proper divisors (1).

645601301 is an equidigital number, since it uses as much as digits as its factorization.

645601301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 645601301 is about 25408.6855425463. The cubic root of 645601301 is about 864.2806680787.

Adding to 645601301 its reverse (103106546), we get a palindrome (748707847).

The spelling of 645601301 in words is "six hundred forty-five million, six hundred one thousand, three hundred one".