261652849 has 4 divisors (see below), whose sum is σ = 261738736. Its totient is φ = 261566964.

The previous prime is 261652847. The next prime is 261652861. The reversal of 261652849 is 948256162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261652849 - 2¹ = 261652847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261652841) 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 3 ways as a sum of consecutive naturals, for example, 38199 + ... + 44524.

It is an arithmetic number, because the mean of its divisors is an integer number (65434684).

Almost surely, 2^261652849 is an apocalyptic number.

It is an amenable number.

261652849 is a deficient number, since it is larger than the sum of its proper divisors (85887).

261652849 is an equidigital number, since it uses as much as digits as its factorization.

261652849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85886.

The product of its digits is 207360, while the sum is 43.

The square root of 261652849 is about 16175.6869715014. The cubic root of 261652849 is about 639.6000504080.

The spelling of 261652849 in words is "two hundred sixty-one million, six hundred fifty-two thousand, eight hundred forty-nine".