261438455 has 8 divisors (see below), whose sum is σ = 313820304. Its totient is φ = 209088000.

The previous prime is 261438433. The next prime is 261438511. The reversal of 261438455 is 554834162.

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

It is not a de Polignac number, because 261438455 - 2¹⁶ = 261372919 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 7 ways as a sum of consecutive naturals, for example, 18560 + ... + 29450.

It is an arithmetic number, because the mean of its divisors is an integer number (39227538).

Almost surely, 2^261438455 is an apocalyptic number.

261438455 is a deficient number, since it is larger than the sum of its proper divisors (52381849).

261438455 is a wasteful number, since it uses less digits than its factorization.

261438455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15697.

The product of its digits is 115200, while the sum is 38.

The square root of 261438455 is about 16169.0585687603. The cubic root of 261438455 is about 639.4253101191.

The spelling of 261438455 in words is "two hundred sixty-one million, four hundred thirty-eight thousand, four hundred fifty-five".