621743513 has 4 divisors (see below), whose sum is σ = 623730228. Its totient is φ = 619756800.

The previous prime is 621743503. The next prime is 621743527. The reversal of 621743513 is 315347126.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 315347126 = 2 ⋅157673563.

It can be written as a sum of positive squares in 2 ways, for example, as 202435984 + 419307529 = 14228^2 + 20477^2 .

It is a cyclic number.

It is not a de Polignac number, because 621743513 - 2⁴ = 621743497 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 621743513.

It is not an unprimeable number, because it can be changed into a prime (621743503) 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, 992888 + ... + 993513.

It is an arithmetic number, because the mean of its divisors is an integer number (155932557).

Almost surely, 2^621743513 is an apocalyptic number.

It is an amenable number.

621743513 is a deficient number, since it is larger than the sum of its proper divisors (1986715).

621743513 is a wasteful number, since it uses less digits than its factorization.

621743513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986714.

The product of its digits is 15120, while the sum is 32.

The square root of 621743513 is about 24934.7852005988. The cubic root of 621743513 is about 853.5004496341.

The spelling of 621743513 in words is "six hundred twenty-one million, seven hundred forty-three thousand, five hundred thirteen".