621436143 has 4 divisors (see below), whose sum is σ = 828581528. Its totient is φ = 414290760.

The previous prime is 621436117. The next prime is 621436163. The reversal of 621436143 is 341634126.

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

It is not a de Polignac number, because 621436143 - 2⁵ = 621436111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 621436143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621436163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103572688 + ... + 103572693.

It is an arithmetic number, because the mean of its divisors is an integer number (207145382).

Almost surely, 2^621436143 is an apocalyptic number.

621436143 is a deficient number, since it is larger than the sum of its proper divisors (207145385).

621436143 is a wasteful number, since it uses less digits than its factorization.

621436143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207145384.

The product of its digits is 10368, while the sum is 30.

The square root of 621436143 is about 24928.6209606548. The cubic root of 621436143 is about 853.3597787248.

It can be divided in two parts, 62143 and 6143, that added together give a palindrome (68286).

The spelling of 621436143 in words is "six hundred twenty-one million, four hundred thirty-six thousand, one hundred forty-three".