261849853 has 8 divisors (see below), whose sum is σ = 263267648. Its totient is φ = 260436384.

The previous prime is 261849761. The next prime is 261849857. The reversal of 261849853 is 358948162.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261849853 is a prime.

It is a super-2 number, since 2×261849853² = 137130691032243218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261849857) 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, 245800 + ... + 246862.

It is an arithmetic number, because the mean of its divisors is an integer number (32908456).

Almost surely, 2^261849853 is an apocalyptic number.

It is an amenable number.

261849853 is a deficient number, since it is larger than the sum of its proper divisors (1417795).

261849853 is a wasteful number, since it uses less digits than its factorization.

261849853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2163.

The product of its digits is 414720, while the sum is 46.

The square root of 261849853 is about 16181.7753352344. The cubic root of 261849853 is about 639.7605329691.

The spelling of 261849853 in words is "two hundred sixty-one million, eight hundred forty-nine thousand, eight hundred fifty-three".