261190943 has 8 divisors (see below), whose sum is σ = 286590528. Its totient is φ = 236549664.

The previous prime is 261190939. The next prime is 261190973. The reversal of 261190943 is 349091162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261190943 - 2² = 261190939 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261190913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188855 + ... + 190232.

It is an arithmetic number, because the mean of its divisors is an integer number (35823816).

Almost surely, 2^261190943 is an apocalyptic number.

261190943 is a deficient number, since it is larger than the sum of its proper divisors (25399585).

261190943 is a wasteful number, since it uses less digits than its factorization.

261190943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379153.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 261190943 is about 16161.4028784632. The cubic root of 261190943 is about 639.2234583951.

The spelling of 261190943 in words is "two hundred sixty-one million, one hundred ninety thousand, nine hundred forty-three".