641654531 has 8 divisors (see below), whose sum is σ = 734640480. Its totient is φ = 548998848.

The previous prime is 641654467. The next prime is 641654537. The reversal of 641654531 is 135456146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641654531 - 2⁶ = 641654467 is a prime.

It is a super-2 number, since 2×641654531² = 823441074305659922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641654491 and 641654500.

It is not an unprimeable number, because it can be changed into a prime (641654537) 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, 78386 + ... + 86183.

It is an arithmetic number, because the mean of its divisors is an integer number (91830060).

Almost surely, 2^641654531 is an apocalyptic number.

641654531 is a deficient number, since it is larger than the sum of its proper divisors (92985949).

641654531 is a wasteful number, since it uses less digits than its factorization.

641654531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165133.

The product of its digits is 43200, while the sum is 35.

The square root of 641654531 is about 25330.9007143449. The cubic root of 641654531 is about 862.5158576094.

The spelling of 641654531 in words is "six hundred forty-one million, six hundred fifty-four thousand, five hundred thirty-one".