261118445 has 16 divisors (see below), whose sum is σ = 363014400. Its totient is φ = 176598144.

The previous prime is 261118441. The next prime is 261118499. The reversal of 261118445 is 544811162.

It is a cyclic number.

It is not a de Polignac number, because 261118445 - 2² = 261118441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261118441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48545 + ... + 53654.

It is an arithmetic number, because the mean of its divisors is an integer number (22688400).

Almost surely, 2^261118445 is an apocalyptic number.

It is an amenable number.

261118445 is a deficient number, since it is larger than the sum of its proper divisors (101895955).

261118445 is a wasteful number, since it uses less digits than its factorization.

261118445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102284.

The product of its digits is 7680, while the sum is 32.

The square root of 261118445 is about 16159.1597863255. The cubic root of 261118445 is about 639.1643104653.

The spelling of 261118445 in words is "two hundred sixty-one million, one hundred eighteen thousand, four hundred forty-five".