538305261 has 32 divisors (see below), whose sum is σ = 794640000. Its totient is φ = 322043904.

The previous prime is 538305239. The next prime is 538305281. The reversal of 538305261 is 162503835.

It is a de Polignac number, because none of the positive numbers 2^k-538305261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538305211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 430365 + ... + 431613.

It is an arithmetic number, because the mean of its divisors is an integer number (24832500).

Almost surely, 2^538305261 is an apocalyptic number.

It is an amenable number.

538305261 is a deficient number, since it is larger than the sum of its proper divisors (256334739).

538305261 is a wasteful number, since it uses less digits than its factorization.

538305261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 538305261 is about 23201.4064444378. The cubic root of 538305261 is about 813.4724978919.

The spelling of 538305261 in words is "five hundred thirty-eight million, three hundred five thousand, two hundred sixty-one".