34821991 has 2 divisors, whose sum is σ = 34821992. Its totient is φ = 34821990.

The previous prime is 34821979. The next prime is 34822009. The reversal of 34821991 is 19912843.

It is a weak prime.

It is an emirp because it is prime and its reverse (19912843) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 34821991 - 2¹¹ = 34819943 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 34821991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (34821191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17410995 + 17410996.

It is an arithmetic number, because the mean of its divisors is an integer number (17410996).

Almost surely, 2^34821991 is an apocalyptic number.

34821991 is a deficient number, since it is larger than the sum of its proper divisors (1).

34821991 is an equidigital number, since it uses as much as digits as its factorization.

34821991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 34821991 is about 5901.0160989443. The cubic root of 34821991 is about 326.5511365490.

The spelling of 34821991 in words is "thirty-four million, eight hundred twenty-one thousand, nine hundred ninety-one".