208226381 has 4 divisors (see below), whose sum is σ = 227156064. Its totient is φ = 189296700.

The previous prime is 208226371. The next prime is 208226443. The reversal of 208226381 is 183622802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 208226381 - 2²² = 204032077 is a prime.

It is a super-2 number, since 2×208226381² = 86716451488714322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208226371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9464825 + ... + 9464846.

It is an arithmetic number, because the mean of its divisors is an integer number (56789016).

Almost surely, 2^208226381 is an apocalyptic number.

It is an amenable number.

208226381 is a deficient number, since it is larger than the sum of its proper divisors (18929683).

208226381 is a wasteful number, since it uses less digits than its factorization.

208226381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18929682.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 208226381 is about 14430.0513166101. The cubic root of 208226381 is about 592.7140885736.

The spelling of 208226381 in words is "two hundred eight million, two hundred twenty-six thousand, three hundred eighty-one".