261356199 has 16 divisors (see below), whose sum is σ = 391598592. Its totient is φ = 153841248.

The previous prime is 261356141. The next prime is 261356203. The reversal of 261356199 is 991653162.

It is not a de Polignac number, because 261356199 - 2⁹ = 261355687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261356199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261356129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144787 + ... + 146580.

It is an arithmetic number, because the mean of its divisors is an integer number (24474912).

Almost surely, 2^261356199 is an apocalyptic number.

261356199 is a deficient number, since it is larger than the sum of its proper divisors (130242393).

261356199 is a wasteful number, since it uses less digits than its factorization.

261356199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291406.

The product of its digits is 87480, while the sum is 42.

The square root of 261356199 is about 16166.5147449906. The cubic root of 261356199 is about 639.3582426004.

The spelling of 261356199 in words is "two hundred sixty-one million, three hundred fifty-six thousand, one hundred ninety-nine".