2017634921 has 2 divisors, whose sum is σ = 2017634922. Its totient is φ = 2017634920.

The previous prime is 2017634897. The next prime is 2017634939. The reversal of 2017634921 is 1294367102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1852872025 + 164762896 = 43045^2 + 12836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2017634921 is a prime.

It is not a weakly prime, because it can be changed into another prime (2017634321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1008817460 + 1008817461.

It is an arithmetic number, because the mean of its divisors is an integer number (1008817461).

Almost surely, 2^2017634921 is an apocalyptic number.

It is an amenable number.

2017634921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2017634921 is an equidigital number, since it uses as much as digits as its factorization.

2017634921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 2017634921 is about 44918.0912439520. The cubic root of 2017634921 is about 1263.6133202798.

The spelling of 2017634921 in words is "two billion, seventeen million, six hundred thirty-four thousand, nine hundred twenty-one".