641542401 has 12 divisors (see below), whose sum is σ = 935670528. Its totient is φ = 423541944.

The previous prime is 641542399. The next prime is 641542403. The reversal of 641542401 is 104245146.

641542401 is a `hidden beast` number, since 6 + 415 + 4 + 240 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (641542399) and next prime (641542403).

It is not a de Polignac number, because 641542401 - 2¹ = 641542399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641542403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 345105 + ... + 346958.

It is an arithmetic number, because the mean of its divisors is an integer number (77972544).

Almost surely, 2^641542401 is an apocalyptic number.

It is an amenable number.

641542401 is a deficient number, since it is larger than the sum of its proper divisors (294128127).

641542401 is a wasteful number, since it uses less digits than its factorization.

641542401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692172 (or 692169 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 641542401 is about 25328.6873130054. The cubic root of 641542401 is about 862.4656127437.

Adding to 641542401 its reverse (104245146), we get a palindrome (745787547).

The spelling of 641542401 in words is "six hundred forty-one million, five hundred forty-two thousand, four hundred one".