621155427 has 4 divisors (see below), whose sum is σ = 828207240. Its totient is φ = 414103616.

The previous prime is 621155413. The next prime is 621155441. The reversal of 621155427 is 724551126.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (621155413) and next prime (621155441).

It is a cyclic number.

It is not a de Polignac number, because 621155427 - 2¹² = 621151331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621155627) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 103525902 + ... + 103525907.

It is an arithmetic number, because the mean of its divisors is an integer number (207051810).

Almost surely, 2^621155427 is an apocalyptic number.

621155427 is a deficient number, since it is larger than the sum of its proper divisors (207051813).

621155427 is a wasteful number, since it uses less digits than its factorization.

621155427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207051812.

The product of its digits is 16800, while the sum is 33.

The square root of 621155427 is about 24922.9899289792. The cubic root of 621155427 is about 853.2312657496.

The spelling of 621155427 in words is "six hundred twenty-one million, one hundred fifty-five thousand, four hundred twenty-seven".