34878521 has 2 divisors, whose sum is σ = 34878522. Its totient is φ = 34878520.

The previous prime is 34878497. The next prime is 34878527. The reversal of 34878521 is 12587843.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25361296 + 9517225 = 5036^2 + 3085^2 .

It is an emirp because it is prime and its reverse (12587843) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 34878521 - 2¹⁰ = 34877497 is a prime.

It is a super-2 number, since 2×34878521² = 2433022454294882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (34878527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17439260 + 17439261.

It is an arithmetic number, because the mean of its divisors is an integer number (17439261).

Almost surely, 2^34878521 is an apocalyptic number.

It is an amenable number.

34878521 is a deficient number, since it is larger than the sum of its proper divisors (1).

34878521 is an equidigital number, since it uses as much as digits as its factorization.

34878521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 38.

The square root of 34878521 is about 5905.8040096163. The cubic root of 34878521 is about 326.7277486547.

The spelling of 34878521 in words is "thirty-four million, eight hundred seventy-eight thousand, five hundred twenty-one".