621012653 has 4 divisors (see below), whose sum is σ = 623207328. Its totient is φ = 618817980.

The previous prime is 621012611. The next prime is 621012661. The reversal of 621012653 is 356210126.

621012653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 621012653 - 2⁶ = 621012589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621012683) 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, 1096913 + ... + 1097478.

It is an arithmetic number, because the mean of its divisors is an integer number (155801832).

Almost surely, 2^621012653 is an apocalyptic number.

It is an amenable number.

621012653 is a deficient number, since it is larger than the sum of its proper divisors (2194675).

621012653 is a wasteful number, since it uses less digits than its factorization.

621012653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194674.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 621012653 is about 24920.1254611609. The cubic root of 621012653 is about 853.1658883523.

Adding to 621012653 its reverse (356210126), we get a palindrome (977222779).

The spelling of 621012653 in words is "six hundred twenty-one million, twelve thousand, six hundred fifty-three".