261141507 has 24 divisors (see below), whose sum is σ = 413298288. Its totient is φ = 157574400.

The previous prime is 261141499. The next prime is 261141509. The reversal of 261141507 is 705141162.

It is a happy number.

261141507 is a `hidden beast` number, since 2 + 611 + 41 + 5 + 0 + 7 = 666.

It is not a de Polignac number, because 261141507 - 2³ = 261141499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261141509) 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, 17407 + ... + 28727.

It is an arithmetic number, because the mean of its divisors is an integer number (17220762).

Almost surely, 2^261141507 is an apocalyptic number.

261141507 is a deficient number, since it is larger than the sum of its proper divisors (152156781).

261141507 is a wasteful number, since it uses less digits than its factorization.

261141507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11571 (or 11568 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 261141507 is about 16159.8733596523. The cubic root of 261141507 is about 639.1831269241.

Adding to 261141507 its reverse (705141162), we get a palindrome (966282669).

The spelling of 261141507 in words is "two hundred sixty-one million, one hundred forty-one thousand, five hundred seven".