261797698 has 8 divisors (see below), whose sum is σ = 393214860. Its totient is φ = 130726080.

The previous prime is 261797663. The next prime is 261797699. The reversal of 261797698 is 896797162.

It can be written as a sum of positive squares in 2 ways, for example, as 243453609 + 18344089 = 15603^2 + 4283^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (261797699) 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, 84483 + ... + 87526.

Almost surely, 2^261797698 is an apocalyptic number.

261797698 is a deficient number, since it is larger than the sum of its proper divisors (131417162).

261797698 is a wasteful number, since it uses less digits than its factorization.

261797698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172772.

The product of its digits is 2286144, while the sum is 55.

The square root of 261797698 is about 16180.1637198145. The cubic root of 261797698 is about 639.7180545210.

The spelling of 261797698 in words is "two hundred sixty-one million, seven hundred ninety-seven thousand, six hundred ninety-eight".