621076613 has 4 divisors (see below), whose sum is σ = 648079968. Its totient is φ = 594073260.

The previous prime is 621076559. The next prime is 621076619. The reversal of 621076613 is 316670126.

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, and also an emirpimes, since its reverse is a distinct semiprime: 316670126 = 2 ⋅158335063.

It is a cyclic number.

It is not a de Polignac number, because 621076613 - 2⁶ = 621076549 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 621076613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621076619) 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, 13501643 + ... + 13501688.

It is an arithmetic number, because the mean of its divisors is an integer number (162019992).

Almost surely, 2^621076613 is an apocalyptic number.

It is an amenable number.

621076613 is a deficient number, since it is larger than the sum of its proper divisors (27003355).

621076613 is a wasteful number, since it uses less digits than its factorization.

621076613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27003354.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 621076613 is about 24921.4087282401. The cubic root of 621076613 is about 853.1951774050.

The spelling of 621076613 in words is "six hundred twenty-one million, seventy-six thousand, six hundred thirteen".