621057 has 8 divisors (see below), whose sum is σ = 832480. Its totient is φ = 411840.

The previous prime is 621043. The next prime is 621059. The reversal of 621057 is 750126.

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

It is not a de Polignac number, because 621057 - 2⁷ = 620929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621059) 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, 294 + ... + 1152.

It is an arithmetic number, because the mean of its divisors is an integer number (104060).

2⁶²¹⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

621057 is a deficient number, since it is larger than the sum of its proper divisors (211423).

621057 is a wasteful number, since it uses less digits than its factorization.

621057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 621057 is about 788.0716972459. The cubic root of 621057 is about 85.3186196284.

The spelling of 621057 in words is "six hundred twenty-one thousand, fifty-seven".