621041691 has 8 divisors (see below), whose sum is σ = 845673984. Its totient is φ = 405218600.

The previous prime is 621041683. The next prime is 621041723. The reversal of 621041691 is 196140126.

It is a happy number.

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 621041691 - 2³ = 621041683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621041591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2202135 + ... + 2202416.

It is an arithmetic number, because the mean of its divisors is an integer number (105709248).

Almost surely, 2^621041691 is an apocalyptic number.

621041691 is a deficient number, since it is larger than the sum of its proper divisors (224632293).

621041691 is a wasteful number, since it uses less digits than its factorization.

621041691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4404601.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 621041691 is about 24920.7080758152. The cubic root of 621041691 is about 853.1791859048.

The spelling of 621041691 in words is "six hundred twenty-one million, forty-one thousand, six hundred ninety-one".