621861505 has 8 divisors (see below), whose sum is σ = 757372032. Its totient is φ = 490063728.

The previous prime is 621861467. The next prime is 621861551. The reversal of 621861505 is 505168126.

It is a happy number.

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

It is not a de Polignac number, because 621861505 - 2¹⁷ = 621730433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 927817 + ... + 928486.

It is an arithmetic number, because the mean of its divisors is an integer number (94671504).

Almost surely, 2^621861505 is an apocalyptic number.

It is an amenable number.

621861505 is a deficient number, since it is larger than the sum of its proper divisors (135510527).

621861505 is a wasteful number, since it uses less digits than its factorization.

621861505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856375.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 621861505 is about 24937.1511003162. The cubic root of 621861505 is about 853.5544375209.

The spelling of 621861505 in words is "six hundred twenty-one million, eight hundred sixty-one thousand, five hundred five".