261242454 has 16 divisors (see below), whose sum is σ = 569983680. Its totient is φ = 79164360.

The previous prime is 261242453. The next prime is 261242473. The reversal of 261242454 is 454242162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261242453) 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, 1979044 + ... + 1979175.

It is an arithmetic number, because the mean of its divisors is an integer number (35623980).

Almost surely, 2^261242454 is an apocalyptic number.

261242454 is an abundant number, since it is smaller than the sum of its proper divisors (308741226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261242454 is a wasteful number, since it uses less digits than its factorization.

261242454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3958235.

The product of its digits is 15360, while the sum is 30.

The square root of 261242454 is about 16162.9964424917. The cubic root of 261242454 is about 639.2654773039.

The spelling of 261242454 in words is "two hundred sixty-one million, two hundred forty-two thousand, four hundred fifty-four".