621994135 has 8 divisors (see below), whose sum is σ = 853020576. Its totient is φ = 426510240.

The previous prime is 621994133. The next prime is 621994159. The reversal of 621994135 is 531499126.

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

It is not a de Polignac number, because 621994135 - 2¹ = 621994133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621994133) 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 7 ways as a sum of consecutive naturals, for example, 8885596 + ... + 8885665.

It is an arithmetic number, because the mean of its divisors is an integer number (106627572).

Almost surely, 2^621994135 is an apocalyptic number.

621994135 is a deficient number, since it is larger than the sum of its proper divisors (231026441).

621994135 is a wasteful number, since it uses less digits than its factorization.

621994135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17771273.

The product of its digits is 58320, while the sum is 40.

The square root of 621994135 is about 24939.8102438651. The cubic root of 621994135 is about 853.6151149531.

The spelling of 621994135 in words is "six hundred twenty-one million, nine hundred ninety-four thousand, one hundred thirty-five".