641530953 has 48 divisors (see below), whose sum is σ = 1153276800. Its totient is φ = 335301120.

The previous prime is 641530949. The next prime is 641530979. The reversal of 641530953 is 359035146.

641530953 is a `hidden beast` number, since 641 + 5 + 3 + 0 + 9 + 5 + 3 = 666.

It is not a de Polignac number, because 641530953 - 2² = 641530949 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641530933) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25473 + ... + 43953.

It is an arithmetic number, because the mean of its divisors is an integer number (24026600).

Almost surely, 2^641530953 is an apocalyptic number.

641530953 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

641530953 is a deficient number, since it is larger than the sum of its proper divisors (511745847).

641530953 is a wasteful number, since it uses less digits than its factorization.

641530953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18542 (or 18539 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 641530953 is about 25328.4613231835. The cubic root of 641530953 is about 862.4604826255.

The spelling of 641530953 in words is "six hundred forty-one million, five hundred thirty thousand, nine hundred fifty-three".