261742079 has 4 divisors (see below), whose sum is σ = 263409384. Its totient is φ = 260074776.

The previous prime is 261742067. The next prime is 261742097. The reversal of 261742079 is 970247162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261742079 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 (261742049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833417 + ... + 833730.

It is an arithmetic number, because the mean of its divisors is an integer number (65852346).

Almost surely, 2^261742079 is an apocalyptic number.

261742079 is a deficient number, since it is larger than the sum of its proper divisors (1667305).

261742079 is a wasteful number, since it uses less digits than its factorization.

261742079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667304.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 261742079 is about 16178.4448881838. Note that the first 3 decimals coincide. The cubic root of 261742079 is about 639.6727485478.

The spelling of 261742079 in words is "two hundred sixty-one million, seven hundred forty-two thousand, seventy-nine".