261744453 has 10 divisors (see below), whose sum is σ = 391001094. Its totient is φ = 174496248.

The previous prime is 261744449. The next prime is 261744463. The reversal of 261744453 is 354447162.

It can be written as a sum of positive squares in only one way, i.e., 248913729 + 12830724 = 15777^2 + 3582^2 .

It is not a de Polignac number, because 261744453 - 2² = 261744449 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261744403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1615626 + ... + 1615787.

Almost surely, 2^261744453 is an apocalyptic number.

It is an amenable number.

261744453 is a deficient number, since it is larger than the sum of its proper divisors (129256641).

261744453 is an equidigital number, since it uses as much as digits as its factorization.

261744453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3231425 (or 3231416 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 261744453 is about 16178.5182572447. The cubic root of 261744453 is about 639.6746824853.

The spelling of 261744453 in words is "two hundred sixty-one million, seven hundred forty-four thousand, four hundred fifty-three".