34681721 has 4 divisors (see below), whose sum is σ = 34741392. Its totient is φ = 34622052.

The previous prime is 34681667. The next prime is 34681727. The reversal of 34681721 is 12718643.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12718643 = 7 ⋅1816949.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-34681721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (34681727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28955 + ... + 30128.

It is an arithmetic number, because the mean of its divisors is an integer number (8685348).

Almost surely, 2^34681721 is an apocalyptic number.

It is an amenable number.

34681721 is a deficient number, since it is larger than the sum of its proper divisors (59671).

34681721 is an equidigital number, since it uses as much as digits as its factorization.

34681721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59670.

The product of its digits is 8064, while the sum is 32.

The square root of 34681721 is about 5889.1188644822. The cubic root of 34681721 is about 326.1120752069.

The spelling of 34681721 in words is "thirty-four million, six hundred eighty-one thousand, seven hundred twenty-one".