261221459 has 4 divisors (see below), whose sum is σ = 265503840. Its totient is φ = 256939080.

The previous prime is 261221453. The next prime is 261221461. The reversal of 261221459 is 954122162.

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

It is a cyclic number.

It is not a de Polignac number, because 261221459 - 2⁸ = 261221203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261221453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2141099 + ... + 2141220.

It is an arithmetic number, because the mean of its divisors is an integer number (66375960).

Almost surely, 2^261221459 is an apocalyptic number.

261221459 is a deficient number, since it is larger than the sum of its proper divisors (4282381).

261221459 is an equidigital number, since it uses as much as digits as its factorization.

261221459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4282380.

The product of its digits is 8640, while the sum is 32.

The square root of 261221459 is about 16162.3469520983. The cubic root of 261221459 is about 639.2483517843.

The spelling of 261221459 in words is "two hundred sixty-one million, two hundred twenty-one thousand, four hundred fifty-nine".