261055619 has 16 divisors (see below), whose sum is σ = 295378944. Its totient is φ = 228571200.

The previous prime is 261055607. The next prime is 261055643. The reversal of 261055619 is 916550162.

It is not a de Polignac number, because 261055619 - 2⁸ = 261055363 is a prime.

It is a super-2 number, since 2×261055619² = 136300072422946322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261055699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74327 + ... + 77759.

It is an arithmetic number, because the mean of its divisors is an integer number (18461184).

Almost surely, 2^261055619 is an apocalyptic number.

261055619 is a deficient number, since it is larger than the sum of its proper divisors (34323325).

261055619 is a wasteful number, since it uses less digits than its factorization.

261055619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3698.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 261055619 is about 16157.2156945434. The cubic root of 261055619 is about 639.1130446397.

The spelling of 261055619 in words is "two hundred sixty-one million, fifty-five thousand, six hundred nineteen".