261401206 has 16 divisors (see below), whose sum is σ = 430874640. Its totient is φ = 117950080.

The previous prime is 261401201. The next prime is 261401243. The reversal of 261401206 is 602104162.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261401201) 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, 40351 + ... + 46378.

It is an arithmetic number, because the mean of its divisors is an integer number (26929665).

Almost surely, 2^261401206 is an apocalyptic number.

261401206 is a deficient number, since it is larger than the sum of its proper divisors (169473434).

261401206 is a wasteful number, since it uses less digits than its factorization.

261401206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86879.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 261401206 is about 16167.9066672220. The cubic root of 261401206 is about 639.3949408497.

Adding to 261401206 its reverse (602104162), we get a palindrome (863505368).

The spelling of 261401206 in words is "two hundred sixty-one million, four hundred one thousand, two hundred six".