208231155 has 80 divisors (see below), whose sum is σ = 417060864. Its totient is φ = 98521920.

The previous prime is 208231099. The next prime is 208231159. The reversal of 208231155 is 551132802.

It is a happy number.

It is not a de Polignac number, because 208231155 - 2⁷ = 208231027 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208231159) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 191022 + ... + 192108.

Almost surely, 2^208231155 is an apocalyptic number.

208231155 is an abundant number, since it is smaller than the sum of its proper divisors (208829709).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

208231155 is a wasteful number, since it uses less digits than its factorization.

208231155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158 (or 1149 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 208231155 is about 14430.2167343391. The cubic root of 208231155 is about 592.7186182517.

Adding to 208231155 its reverse (551132802), we get a palindrome (759363957).

The spelling of 208231155 in words is "two hundred eight million, two hundred thirty-one thousand, one hundred fifty-five".