261321892 has 36 divisors (see below), whose sum is σ = 523195540. Its totient is φ = 113508864.

The previous prime is 261321869. The next prime is 261321899. The reversal of 261321892 is 298123162.

261321892 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 7365796 + 253956096 = 2714^2 + 15936^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261321899) 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, 6334 + ... + 23722.

Almost surely, 2^261321892 is an apocalyptic number.

It is an amenable number.

261321892 is an abundant number, since it is smaller than the sum of its proper divisors (261873648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261321892 is a wasteful number, since it uses less digits than its factorization.

261321892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17440 (or 17421 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 261321892 is about 16165.4536589605. The cubic root of 261321892 is about 639.3302661923.

The spelling of 261321892 in words is "two hundred sixty-one million, three hundred twenty-one thousand, eight hundred ninety-two".