261083993 has 4 divisors (see below), whose sum is σ = 262526628. Its totient is φ = 259641360.

The previous prime is 261083957. The next prime is 261084007. The reversal of 261083993 is 399380162.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3545689 + 257538304 = 1883^2 + 16048^2 .

It is a cyclic number.

It is not a de Polignac number, because 261083993 - 2⁶ = 261083929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261083993.

It is not an unprimeable number, because it can be changed into a prime (261083293) 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, 721046 + ... + 721407.

It is an arithmetic number, because the mean of its divisors is an integer number (65631657).

Almost surely, 2^261083993 is an apocalyptic number.

It is an amenable number.

261083993 is a deficient number, since it is larger than the sum of its proper divisors (1442635).

261083993 is a wasteful number, since it uses less digits than its factorization.

261083993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442634.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 261083993 is about 16158.0937303879. The cubic root of 261083993 is about 639.1361987561.

The spelling of 261083993 in words is "two hundred sixty-one million, eighty-three thousand, nine hundred ninety-three".