621103291 has 4 divisors (see below), whose sum is σ = 625571800. Its totient is φ = 616634784.

The previous prime is 621103283. The next prime is 621103303. The reversal of 621103291 is 192301126.

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

It is a cyclic number.

It is not a de Polignac number, because 621103291 - 2³ = 621103283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621103271) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2234046 + ... + 2234323.

It is an arithmetic number, because the mean of its divisors is an integer number (156392950).

Almost surely, 2^621103291 is an apocalyptic number.

621103291 is a deficient number, since it is larger than the sum of its proper divisors (4468509).

621103291 is a wasteful number, since it uses less digits than its factorization.

621103291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4468508.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 621103291 is about 24921.9439651083. The cubic root of 621103291 is about 853.2073934047.

The spelling of 621103291 in words is "six hundred twenty-one million, one hundred three thousand, two hundred ninety-one".