261007550 has 12 divisors (see below), whose sum is σ = 485474136. Its totient is φ = 104403000.

The previous prime is 261007543. The next prime is 261007553. The reversal of 261007550 is 55700162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261007553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2610026 + ... + 2610125.

It is an arithmetic number, because the mean of its divisors is an integer number (40456178).

Almost surely, 2^261007550 is an apocalyptic number.

261007550 is a deficient number, since it is larger than the sum of its proper divisors (224466586).

261007550 is a wasteful number, since it uses less digits than its factorization.

261007550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5220163 (or 5220158 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 261007550 is about 16155.7280863476. The cubic root of 261007550 is about 639.0738149271.

The spelling of 261007550 in words is "two hundred sixty-one million, seven thousand, five hundred fifty".