621401343 has 4 divisors (see below), whose sum is σ = 828535128. Its totient is φ = 414267560.

The previous prime is 621401321. The next prime is 621401359. The reversal of 621401343 is 343104126.

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 621401343 - 2⁸ = 621401087 is a prime.

It is a super-2 number, since 2×621401343² = 772279258164407298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621401383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103566888 + ... + 103566893.

It is an arithmetic number, because the mean of its divisors is an integer number (207133782).

Almost surely, 2^621401343 is an apocalyptic number.

621401343 is a deficient number, since it is larger than the sum of its proper divisors (207133785).

621401343 is a wasteful number, since it uses less digits than its factorization.

621401343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207133784.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 621401343 is about 24927.9229580003. The cubic root of 621401343 is about 853.3438492390.

Adding to 621401343 its reverse (343104126), we get a palindrome (964505469).

The spelling of 621401343 in words is "six hundred twenty-one million, four hundred one thousand, three hundred forty-three".