261490117 has 24 divisors (see below), whose sum is σ = 309868416. Its totient is φ = 219991968.

The previous prime is 261490081. The next prime is 261490123. The reversal of 261490117 is 711094162.

261490117 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261490117 - 2²³ = 253101509 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 (261490147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 994128 + ... + 994390.

It is an arithmetic number, because the mean of its divisors is an integer number (12911184).

Almost surely, 2^261490117 is an apocalyptic number.

It is an amenable number.

261490117 is a deficient number, since it is larger than the sum of its proper divisors (48378299).

261490117 is a wasteful number, since it uses less digits than its factorization.

261490117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 261490117 is about 16170.6560472975. The cubic root of 261490117 is about 639.4674255948.

The spelling of 261490117 in words is "two hundred sixty-one million, four hundred ninety thousand, one hundred seventeen".