261148747 has 8 divisors (see below), whose sum is σ = 281044512. Its totient is φ = 241756800.

The previous prime is 261148637. The next prime is 261148753. The reversal of 261148747 is 747841162.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 261148747 - 2¹⁵ = 261115979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261148777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124879 + ... + 126952.

It is an arithmetic number, because the mean of its divisors is an integer number (35130564).

Almost surely, 2^261148747 is an apocalyptic number.

261148747 is a deficient number, since it is larger than the sum of its proper divisors (19895765).

261148747 is a wasteful number, since it uses less digits than its factorization.

261148747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251909.

The product of its digits is 75264, while the sum is 40.

The square root of 261148747 is about 16160.0973697562. The cubic root of 261148747 is about 639.1890338660.

The spelling of 261148747 in words is "two hundred sixty-one million, one hundred forty-eight thousand, seven hundred forty-seven".