621540107 has 8 divisors (see below), whose sum is σ = 623999376. Its totient is φ = 619086592.

The previous prime is 621540091. The next prime is 621540137. The reversal of 621540107 is 701045126.

621540107 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 621540107 - 2⁴ = 621540091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621540137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399443 + ... + 400995.

It is an arithmetic number, because the mean of its divisors is an integer number (77999922).

Almost surely, 2^621540107 is an apocalyptic number.

621540107 is a deficient number, since it is larger than the sum of its proper divisors (2459269).

621540107 is a wasteful number, since it uses less digits than its factorization.

621540107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2877.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 621540107 is about 24930.7061071282. The cubic root of 621540107 is about 853.4073640641.

The spelling of 621540107 in words is "six hundred twenty-one million, five hundred forty thousand, one hundred seven".