261401210 has 64 divisors (see below), whose sum is σ = 564364800. Its totient is φ = 85231872.

The previous prime is 261401201. The next prime is 261401243. The reversal of 261401210 is 12104162.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 368336 + ... + 369044.

It is an arithmetic number, because the mean of its divisors is an integer number (8818200).

Almost surely, 2^261401210 is an apocalyptic number.

261401210 is an abundant number, since it is smaller than the sum of its proper divisors (302963590).

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

261401210 is a wasteful number, since it uses less digits than its factorization.

261401210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 261401210 is about 16167.9067909238. The cubic root of 261401210 is about 639.3949441111.

Adding to 261401210 its reverse (12104162), we get a palindrome (273505372).

The spelling of 261401210 in words is "two hundred sixty-one million, four hundred one thousand, two hundred ten".