641091451 has 24 divisors (see below), whose sum is σ = 876146544. Its totient is φ = 461119680.

The previous prime is 641091433. The next prime is 641091509. The reversal of 641091451 is 154190146.

It is not a de Polignac number, because 641091451 - 2¹¹ = 641089403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641091401) 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 23 ways as a sum of consecutive naturals, for example, 38740 + ... + 52753.

It is an arithmetic number, because the mean of its divisors is an integer number (36506106).

Almost surely, 2^641091451 is an apocalyptic number.

641091451 is a deficient number, since it is larger than the sum of its proper divisors (235055093).

641091451 is a wasteful number, since it uses less digits than its factorization.

641091451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91531 (or 91524 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 641091451 is about 25319.7837865966. The cubic root of 641091451 is about 862.2634852714.

The spelling of 641091451 in words is "six hundred forty-one million, ninety-one thousand, four hundred fifty-one".