34991639 has 2 divisors, whose sum is σ = 34991640. Its totient is φ = 34991638.

The previous prime is 34991623. The next prime is 34991647. The reversal of 34991639 is 93619943.

It is a strong prime.

It is an emirp because it is prime and its reverse (93619943) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 34991639 - 2⁴ = 34991623 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 34991639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (34991609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17495819 + 17495820.

It is an arithmetic number, because the mean of its divisors is an integer number (17495820).

Almost surely, 2^34991639 is an apocalyptic number.

34991639 is a deficient number, since it is larger than the sum of its proper divisors (1).

34991639 is an equidigital number, since it uses as much as digits as its factorization.

34991639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464, while the sum is 44.

The square root of 34991639 is about 5915.3731074210. The cubic root of 34991639 is about 327.0805819108.

The spelling of 34991639 in words is "thirty-four million, nine hundred ninety-one thousand, six hundred thirty-nine".