261102553 has 8 divisors (see below), whose sum is σ = 274095360. Its totient is φ = 248395440.

The previous prime is 261102547. The next prime is 261102557. The reversal of 261102553 is 355201162.

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

It is a cyclic number.

It is not a de Polignac number, because 261102553 - 2⁹ = 261102041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261102557) 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, 69550 + ... + 73207.

It is an arithmetic number, because the mean of its divisors is an integer number (34261920).

Almost surely, 2^261102553 is an apocalyptic number.

It is an amenable number.

261102553 is a deficient number, since it is larger than the sum of its proper divisors (12992807).

261102553 is a wasteful number, since it uses less digits than its factorization.

261102553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142847.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 261102553 is about 16158.6680453557. The cubic root of 261102553 is about 639.1513434185.

The spelling of 261102553 in words is "two hundred sixty-one million, one hundred two thousand, five hundred fifty-three".