621506461 has 8 divisors (see below), whose sum is σ = 633606624. Its totient is φ = 609420240.

The previous prime is 621506423. The next prime is 621506489. The reversal of 621506461 is 164605126.

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 621506461 - 2¹⁵ = 621473693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621506411) 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, 155490 + ... + 159436.

It is an arithmetic number, because the mean of its divisors is an integer number (79200828).

Almost surely, 2^621506461 is an apocalyptic number.

It is an amenable number.

621506461 is a deficient number, since it is larger than the sum of its proper divisors (12100163).

621506461 is a wasteful number, since it uses less digits than its factorization.

621506461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6971.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 621506461 is about 24930.0313076418. The cubic root of 621506461 is about 853.3919645417.

The spelling of 621506461 in words is "six hundred twenty-one million, five hundred six thousand, four hundred sixty-one".