64021901 has 2 divisors, whose sum is σ = 64021902. Its totient is φ = 64021900.

The previous prime is 64021861. The next prime is 64021921. The reversal of 64021901 is 10912046.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61622500 + 2399401 = 7850^2 + 1549^2 .

It is a cyclic number.

It is not a de Polignac number, because 64021901 - 2²² = 59827597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64021921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32010950 + 32010951.

It is an arithmetic number, because the mean of its divisors is an integer number (32010951).

Almost surely, 2^64021901 is an apocalyptic number.

It is an amenable number.

64021901 is a deficient number, since it is larger than the sum of its proper divisors (1).

64021901 is an equidigital number, since it uses as much as digits as its factorization.

64021901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 64021901 is about 8001.3686954171. The cubic root of 64021901 is about 400.0456218797.

Adding to 64021901 its reverse (10912046), we get a palindrome (74933947).

The spelling of 64021901 in words is "sixty-four million, twenty-one thousand, nine hundred one".