34721891 has 6 divisors (see below), whose sum is σ = 35879076. Its totient is φ = 33600900.

The previous prime is 34721867. The next prime is 34721909. The reversal of 34721891 is 19812743.

It is not a de Polignac number, because 34721891 - 2¹⁴ = 34705507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (34721801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17105 + ... + 19026.

It is an arithmetic number, because the mean of its divisors is an integer number (5979846).

Almost surely, 2^34721891 is an apocalyptic number.

34721891 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

34721891 is a deficient number, since it is larger than the sum of its proper divisors (1157185).

34721891 is an equidigital number, since it uses as much as digits as its factorization.

34721891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36193 (or 36162 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 34721891 is about 5892.5284046833. The cubic root of 34721891 is about 326.2379327412.

The spelling of 34721891 in words is "thirty-four million, seven hundred twenty-one thousand, eight hundred ninety-one".