621145471 has 4 divisors (see below), whose sum is σ = 622055592. Its totient is φ = 620235352.

The previous prime is 621145463. The next prime is 621145487. The reversal of 621145471 is 174541126.

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 621145471 - 2³ = 621145463 is a prime.

It is a super-3 number, since 3×621145471³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621145411) 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, 454036 + ... + 455401.

It is an arithmetic number, because the mean of its divisors is an integer number (155513898).

Almost surely, 2^621145471 is an apocalyptic number.

621145471 is a deficient number, since it is larger than the sum of its proper divisors (910121).

621145471 is an equidigital number, since it uses as much as digits as its factorization.

621145471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910120.

The product of its digits is 6720, while the sum is 31.

The square root of 621145471 is about 24922.7901929138. The cubic root of 621145471 is about 853.2267071397.

Adding to 621145471 its reverse (174541126), we get a palindrome (795686597).

The spelling of 621145471 in words is "six hundred twenty-one million, one hundred forty-five thousand, four hundred seventy-one".