261472309 has 8 divisors (see below), whose sum is σ = 301007808. Its totient is φ = 222482400.

The previous prime is 261472307. The next prime is 261472331. The reversal of 261472309 is 903274162.

261472309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 261472309 - 2¹ = 261472307 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 (261472307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135367 + ... + 137284.

It is an arithmetic number, because the mean of its divisors is an integer number (37625976).

Almost surely, 2^261472309 is an apocalyptic number.

It is an amenable number.

261472309 is a deficient number, since it is larger than the sum of its proper divisors (39535499).

261472309 is a wasteful number, since it uses less digits than its factorization.

261472309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272795.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 261472309 is about 16170.1054109118. The cubic root of 261472309 is about 639.4529089284.

The spelling of 261472309 in words is "two hundred sixty-one million, four hundred seventy-two thousand, three hundred nine".