621157255 has 8 divisors (see below), whose sum is σ = 753764400. Its totient is φ = 491342016.

The previous prime is 621157247. The next prime is 621157279. The reversal of 621157255 is 552751126.

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 621157255 - 2³ = 621157247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 621157255.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 697485 + ... + 698374.

It is an arithmetic number, because the mean of its divisors is an integer number (94220550).

Almost surely, 2^621157255 is an apocalyptic number.

621157255 is a deficient number, since it is larger than the sum of its proper divisors (132607145).

621157255 is a wasteful number, since it uses less digits than its factorization.

621157255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395953.

The product of its digits is 21000, while the sum is 34.

The square root of 621157255 is about 24923.0266019198. The cubic root of 621157255 is about 853.2321027410.

The spelling of 621157255 in words is "six hundred twenty-one million, one hundred fifty-seven thousand, two hundred fifty-five".