538087561 has 4 divisors (see below), whose sum is σ = 587004624. Its totient is φ = 489170500.

The previous prime is 538087549. The next prime is 538087579. The reversal of 538087561 is 165780835.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 538087561 - 2¹⁵ = 538054793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (538087531) 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, 24458515 + ... + 24458536.

It is an arithmetic number, because the mean of its divisors is an integer number (146751156).

Almost surely, 2^538087561 is an apocalyptic number.

It is an amenable number.

538087561 is a deficient number, since it is larger than the sum of its proper divisors (48917063).

538087561 is a wasteful number, since it uses less digits than its factorization.

538087561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48917062.

The product of its (nonzero) digits is 201600, while the sum is 43.

The square root of 538087561 is about 23196.7144440759. The cubic root of 538087561 is about 813.3628223019.

The spelling of 538087561 in words is "five hundred thirty-eight million, eighty-seven thousand, five hundred sixty-one".