641091401 has 2 divisors, whose sum is σ = 641091402. Its totient is φ = 641091400.

The previous prime is 641091391. The next prime is 641091433. The reversal of 641091401 is 104190146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 559369801 + 81721600 = 23651^2 + 9040^2 .

It is a cyclic number.

It is not a de Polignac number, because 641091401 - 2¹⁰ = 641090377 is a prime.

It is a super-2 number, since 2×641091401² = 821996368872285602, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (641021401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320545700 + 320545701.

It is an arithmetic number, because the mean of its divisors is an integer number (320545701).

Almost surely, 2^641091401 is an apocalyptic number.

It is an amenable number.

641091401 is a deficient number, since it is larger than the sum of its proper divisors (1).

641091401 is an equidigital number, since it uses as much as digits as its factorization.

641091401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 641091401 is about 25319.7827992264. The cubic root of 641091401 is about 862.2634628548.

The spelling of 641091401 in words is "six hundred forty-one million, ninety-one thousand, four hundred one".