261160553 has 4 divisors (see below), whose sum is σ = 261218448. Its totient is φ = 261102660.

The previous prime is 261160519. The next prime is 261160589. The reversal of 261160553 is 355061162.

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 261160553 - 2¹² = 261156457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261160853) 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, 21551 + ... + 31412.

It is an arithmetic number, because the mean of its divisors is an integer number (65304612).

Almost surely, 2^261160553 is an apocalyptic number.

It is an amenable number.

261160553 is a deficient number, since it is larger than the sum of its proper divisors (57895).

261160553 is an equidigital number, since it uses as much as digits as its factorization.

261160553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57894.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 261160553 is about 16160.4626480803. The cubic root of 261160553 is about 639.1986658632.

The spelling of 261160553 in words is "two hundred sixty-one million, one hundred sixty thousand, five hundred fifty-three".