261036949 has 4 divisors (see below), whose sum is σ = 261081280. Its totient is φ = 260992620.

The previous prime is 261036929. The next prime is 261036973. The reversal of 261036949 is 949630162.

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 261036949 - 2¹⁵ = 261004181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261036929) 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 3 ways as a sum of consecutive naturals, for example, 11679 + ... + 25660.

It is an arithmetic number, because the mean of its divisors is an integer number (65270320).

Almost surely, 2^261036949 is an apocalyptic number.

It is an amenable number.

261036949 is a deficient number, since it is larger than the sum of its proper divisors (44331).

261036949 is an equidigital number, since it uses as much as digits as its factorization.

261036949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44330.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 261036949 is about 16156.6379237761. The cubic root of 261036949 is about 639.0978083910.

The spelling of 261036949 in words is "two hundred sixty-one million, thirty-six thousand, nine hundred forty-nine".