261654993 has 6 divisors (see below), whose sum is σ = 377946114. Its totient is φ = 174436656.

The previous prime is 261654983. The next prime is 261655019. The reversal of 261654993 is 399456162.

261654993 is a `hidden beast` number, since 2 + 6 + 16 + 549 + 93 = 666.

261654993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 172975104 + 88679889 = 13152^2 + 9417^2 .

It is not a de Polignac number, because 261654993 - 2⁵ = 261654961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261654983) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14536380 + ... + 14536397.

It is an arithmetic number, because the mean of its divisors is an integer number (62991019).

Almost surely, 2^261654993 is an apocalyptic number.

It is an amenable number.

261654993 is a deficient number, since it is larger than the sum of its proper divisors (116291121).

261654993 is a wasteful number, since it uses less digits than its factorization.

261654993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29072783 (or 29072780 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 261654993 is about 16175.7532436669. The cubic root of 261654993 is about 639.6017973777.

The spelling of 261654993 in words is "two hundred sixty-one million, six hundred fifty-four thousand, nine hundred ninety-three".