641440971 has 8 divisors (see below), whose sum is σ = 950282960. Its totient is φ = 427627296.

The previous prime is 641440963. The next prime is 641440973. The reversal of 641440971 is 179044146.

641440971 is a `hidden beast` number, since 641 + 4 + 4 + 0 + 9 + 7 + 1 = 666.

It is not a de Polignac number, because 641440971 - 2³ = 641440963 is a prime.

It is a super-2 number, since 2×641440971² = 822893038554845682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641440973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11878510 + ... + 11878563.

It is an arithmetic number, because the mean of its divisors is an integer number (118785370).

Almost surely, 2^641440971 is an apocalyptic number.

641440971 is a deficient number, since it is larger than the sum of its proper divisors (308841989).

641440971 is a wasteful number, since it uses less digits than its factorization.

641440971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23757082 (or 23757076 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 641440971 is about 25326.6849587545. The cubic root of 641440971 is about 862.4201574484.

It can be divided in two parts, 641440 and 971, that added together give a triangular number (642411 = T₁₁₃₃).

The spelling of 641440971 in words is "six hundred forty-one million, four hundred forty thousand, nine hundred seventy-one".