209641090 has 32 divisors (see below), whose sum is σ = 395176320. Its totient is φ = 79922304.

The previous prime is 209641031. The next prime is 209641097. The reversal of 209641090 is 90146902.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (209641097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69126 + ... + 72094.

It is an arithmetic number, because the mean of its divisors is an integer number (12349260).

Almost surely, 2^209641090 is an apocalyptic number.

209641090 is a deficient number, since it is larger than the sum of its proper divisors (185535230).

209641090 is a wasteful number, since it uses less digits than its factorization.

209641090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3306.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 209641090 is about 14478.9878789921. The cubic root of 209641090 is about 594.0533778890.

Adding to 209641090 its reverse (90146902), we get a palindrome (299787992).

The spelling of 209641090 in words is "two hundred nine million, six hundred forty-one thousand, ninety".