261435455 has 4 divisors (see below), whose sum is σ = 313722552. Its totient is φ = 209148360.

The previous prime is 261435409. The next prime is 261435463. The reversal of 261435455 is 554534162.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 261435455 - 2¹⁴ = 261419071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26143541 + ... + 26143550.

It is an arithmetic number, because the mean of its divisors is an integer number (78430638).

Almost surely, 2^261435455 is an apocalyptic number.

261435455 is a deficient number, since it is larger than the sum of its proper divisors (52287097).

261435455 is an equidigital number, since it uses as much as digits as its factorization.

261435455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52287096.

The product of its digits is 72000, while the sum is 35.

The square root of 261435455 is about 16168.9657987145. The cubic root of 261435455 is about 639.4228643131.

The spelling of 261435455 in words is "two hundred sixty-one million, four hundred thirty-five thousand, four hundred fifty-five".