65131555 has 4 divisors (see below), whose sum is σ = 78157872. Its totient is φ = 52105240.

The previous prime is 65131543. The next prime is 65131579. The reversal of 65131555 is 55513156.

65131555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 65131555 - 2¹³ = 65123363 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6513151 + ... + 6513160.

It is an arithmetic number, because the mean of its divisors is an integer number (19539468).

Almost surely, 2^65131555 is an apocalyptic number.

65131555 is a deficient number, since it is larger than the sum of its proper divisors (13026317).

65131555 is a wasteful number, since it uses less digits than its factorization.

65131555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13026316.

The product of its digits is 11250, while the sum is 31.

The square root of 65131555 is about 8070.4123190826. The cubic root of 65131555 is about 402.3436477198.

The spelling of 65131555 in words is "sixty-five million, one hundred thirty-one thousand, five hundred fifty-five".