261121469 has 16 divisors (see below), whose sum is σ = 307876608. Its totient is φ = 216784512.

The previous prime is 261121453. The next prime is 261121489. The reversal of 261121469 is 964121162.

It is not a de Polignac number, because 261121469 - 2⁴ = 261121453 is a prime.

It is a super-2 number, since 2×261121469² = 136368843145435922, 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 (261121429) 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, 58184 + ... + 62510.

It is an arithmetic number, because the mean of its divisors is an integer number (19242288).

Almost surely, 2^261121469 is an apocalyptic number.

It is an amenable number.

261121469 is a deficient number, since it is larger than the sum of its proper divisors (46755139).

261121469 is a wasteful number, since it uses less digits than its factorization.

261121469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4604.

The product of its digits is 5184, while the sum is 32.

The square root of 261121469 is about 16159.2533552760. The cubic root of 261121469 is about 639.1667778327.

The spelling of 261121469 in words is "two hundred sixty-one million, one hundred twenty-one thousand, four hundred sixty-nine".