613626991 has 2 divisors, whose sum is σ = 613626992. Its totient is φ = 613626990.

The previous prime is 613626967. The next prime is 613626997. The reversal of 613626991 is 199626316.

613626991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 613626991 - 2¹⁷ = 613495919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (613626997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306813495 + 306813496.

It is an arithmetic number, because the mean of its divisors is an integer number (306813496).

Almost surely, 2^613626991 is an apocalyptic number.

613626991 is a deficient number, since it is larger than the sum of its proper divisors (1).

613626991 is an equidigital number, since it uses as much as digits as its factorization.

613626991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 43.

The square root of 613626991 is about 24771.4955341820. The cubic root of 613626991 is about 849.7701759278.

The spelling of 613626991 in words is "six hundred thirteen million, six hundred twenty-six thousand, nine hundred ninety-one".