211673401 has 3 divisors (see below), whose sum is σ = 211687951. Its totient is φ = 211658852.

The previous prime is 211673387. The next prime is 211673419. The reversal of 211673401 is 104376112.

The square root of 211673401 is 14549.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 176863401 + 34810000 = 13299^2 + 5900^2 .

It is not a de Polignac number, because 211673401 - 2⁹ = 211672889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211673491) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7275 + ... + 21823.

Almost surely, 2^211673401 is an apocalyptic number.

211673401 is the 14549-th square number.

211673401 is the 7275-th centered octagonal number.

It is an amenable number.

211673401 is a deficient number, since it is larger than the sum of its proper divisors (14550).

211673401 is an frugal number, since it uses more digits than its factorization.

211673401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29098 (or 14549 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The cubic root of 211673401 is about 595.9668399265.

Multiplying 211673401 by its sum of digits (25), we get a square (5291835025 = 72745²).

The spelling of 211673401 in words is "two hundred eleven million, six hundred seventy-three thousand, four hundred one".