261870597 has 32 divisors (see below), whose sum is σ = 409635200. Its totient is φ = 164882304.

The previous prime is 261870569. The next prime is 261870611. The reversal of 261870597 is 795078162.

It is not a de Polignac number, because 261870597 - 2¹¹ = 261868549 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261870527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 233883 + ... + 234999.

It is an arithmetic number, because the mean of its divisors is an integer number (12801100).

Almost surely, 2^261870597 is an apocalyptic number.

261870597 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

261870597 is a deficient number, since it is larger than the sum of its proper divisors (147764603).

261870597 is a wasteful number, since it uses less digits than its factorization.

261870597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602 (or 1596 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 261870597 is about 16182.4162905297. The cubic root of 261870597 is about 639.7774266735. Note that the first 3 decimals are identical.

The spelling of 261870597 in words is "two hundred sixty-one million, eight hundred seventy thousand, five hundred ninety-seven".