3491472821 has 2 divisors, whose sum is σ = 3491472822. Its totient is φ = 3491472820.

The previous prime is 3491472791. The next prime is 3491472827. The reversal of 3491472821 is 1282741943.

3491472821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3056541796 + 434931025 = 55286^2 + 20855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3491472821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3491472827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1745736410 + 1745736411.

It is an arithmetic number, because the mean of its divisors is an integer number (1745736411).

Almost surely, 2^3491472821 is an apocalyptic number.

It is an amenable number.

3491472821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3491472821 is an equidigital number, since it uses as much as digits as its factorization.

3491472821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 3491472821 is about 59088.6860659467. The cubic root of 3491472821 is about 1517.0604576197.

The spelling of 3491472821 in words is "three billion, four hundred ninety-one million, four hundred seventy-two thousand, eight hundred twenty-one".