208042251 has 8 divisors (see below), whose sum is σ = 277463760. Its totient is φ = 138657792.

The previous prime is 208042249. The next prime is 208042253. The reversal of 208042251 is 152240802.

208042251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (208042249) and next prime (208042253).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 208042251 - 2¹ = 208042249 is a prime.

It is a super-2 number, since 2×208042251² = 86563156402294002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (208042253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8971 + ... + 22283.

It is an arithmetic number, because the mean of its divisors is an integer number (34682970).

Almost surely, 2^208042251 is an apocalyptic number.

208042251 is a deficient number, since it is larger than the sum of its proper divisors (69421509).

208042251 is a wasteful number, since it uses less digits than its factorization.

208042251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18525.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 208042251 is about 14423.6698173523. The cubic root of 208042251 is about 592.5393290492.

The spelling of 208042251 in words is "two hundred eight million, forty-two thousand, two hundred fifty-one".