261507741 has 12 divisors (see below), whose sum is σ = 383257056. Its totient is φ = 158489320.

The previous prime is 261507737. The next prime is 261507751. The reversal of 261507741 is 147705162.

It is not a de Polignac number, because 261507741 - 2² = 261507737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261507731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 359841 + ... + 360566.

It is an arithmetic number, because the mean of its divisors is an integer number (31938088).

Almost surely, 2^261507741 is an apocalyptic number.

It is an amenable number.

261507741 is a deficient number, since it is larger than the sum of its proper divisors (121749315).

261507741 is a wasteful number, since it uses less digits than its factorization.

261507741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720432 (or 720421 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 261507741 is about 16171.2009758088. The cubic root of 261507741 is about 639.4817916199.

The spelling of 261507741 in words is "two hundred sixty-one million, five hundred seven thousand, seven hundred forty-one".