261981453 has 8 divisors (see below), whose sum is σ = 349654816. Its totient is φ = 174481200.

The previous prime is 261981439. The next prime is 261981469. The reversal of 261981453 is 354189162.

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

It is not a de Polignac number, because 261981453 - 2⁴ = 261981437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261981953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39703 + ... + 45828.

It is an arithmetic number, because the mean of its divisors is an integer number (43706852).

Almost surely, 2^261981453 is an apocalyptic number.

It is an amenable number.

261981453 is a deficient number, since it is larger than the sum of its proper divisors (87673363).

261981453 is a wasteful number, since it uses less digits than its factorization.

261981453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86555.

The product of its digits is 51840, while the sum is 39.

The square root of 261981453 is about 16185.8411273557. The cubic root of 261981453 is about 639.8676915623.

The spelling of 261981453 in words is "two hundred sixty-one million, nine hundred eighty-one thousand, four hundred fifty-three".