919657213 has 2 divisors, whose sum is σ = 919657214. Its totient is φ = 919657212.

The previous prime is 919657157. The next prime is 919657283. The reversal of 919657213 is 312756919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 729162009 + 190495204 = 27003^2 + 13802^2 .

It is an emirp because it is prime and its reverse (312756919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 919657213 - 2¹³ = 919649021 is a prime.

It is a super-3 number, since 3×919657213³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 919657213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (919657283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459828606 + 459828607.

It is an arithmetic number, because the mean of its divisors is an integer number (459828607).

Almost surely, 2^919657213 is an apocalyptic number.

It is an amenable number.

919657213 is a deficient number, since it is larger than the sum of its proper divisors (1).

919657213 is an equidigital number, since it uses as much as digits as its factorization.

919657213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102060, while the sum is 43.

The square root of 919657213 is about 30325.8505733969. The cubic root of 919657213 is about 972.4680174431.

The spelling of 919657213 in words is "nine hundred nineteen million, six hundred fifty-seven thousand, two hundred thirteen".