3478979921 has 2 divisors, whose sum is σ = 3478979922. Its totient is φ = 3478979920.

The previous prime is 3478979873. The next prime is 3478979927. The reversal of 3478979921 is 1299798743.

3478979921 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., 3478050625 + 929296 = 58975^2 + 964^2 .

It is a cyclic number.

It is not a de Polignac number, because 3478979921 - 2²² = 3474785617 is a prime.

It is not a weakly prime, because it can be changed into another prime (3478979927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1739489960 + 1739489961.

It is an arithmetic number, because the mean of its divisors is an integer number (1739489961).

Almost surely, 2^3478979921 is an apocalyptic number.

It is an amenable number.

3478979921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3478979921 is an equidigital number, since it uses as much as digits as its factorization.

3478979921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 59.

The square root of 3478979921 is about 58982.8782020681. The cubic root of 3478979921 is about 1515.2488883723.

The spelling of 3478979921 in words is "three billion, four hundred seventy-eight million, nine hundred seventy-nine thousand, nine hundred twenty-one".