621291346 has 16 divisors (see below), whose sum is σ = 1030751064. Its totient is φ = 278999424.

The previous prime is 621291343. The next prime is 621291353. The reversal of 621291346 is 643192126.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 621255625 + 35721 = 24925^2 + 189^2 .

It is a super-2 number, since 2×621291346² = 772005873228983432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (621291343) 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 7 ways as a sum of consecutive naturals, for example, 321955 + ... + 323878.

Almost surely, 2^621291346 is an apocalyptic number.

621291346 is a deficient number, since it is larger than the sum of its proper divisors (409459718).

621291346 is a wasteful number, since it uses less digits than its factorization.

621291346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645885.

The product of its digits is 15552, while the sum is 34.

The square root of 621291346 is about 24925.7165594091. The cubic root of 621291346 is about 853.2934948782.

The spelling of 621291346 in words is "six hundred twenty-one million, two hundred ninety-one thousand, three hundred forty-six".