261362245 has 8 divisors (see below), whose sum is σ = 316740600. Its totient is φ = 207019200.

The previous prime is 261362237. The next prime is 261362251. The reversal of 261362245 is 542263162.

It can be written as a sum of positive squares in 4 ways, for example, as 171662404 + 89699841 = 13102^2 + 9471^2 .

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

It is not a de Polignac number, because 261362245 - 2³ = 261362237 is a prime.

It is a super-2 number, since 2×261362245² = 136620446222880050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258270 + ... + 259279.

It is an arithmetic number, because the mean of its divisors is an integer number (39592575).

Almost surely, 2^261362245 is an apocalyptic number.

It is an amenable number.

261362245 is a deficient number, since it is larger than the sum of its proper divisors (55378355).

261362245 is a wasteful number, since it uses less digits than its factorization.

261362245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517655.

The product of its digits is 17280, while the sum is 31.

The square root of 261362245 is about 16166.7017353572. The cubic root of 261362245 is about 639.3631726922.

The spelling of 261362245 in words is "two hundred sixty-one million, three hundred sixty-two thousand, two hundred forty-five".