65131405 has 4 divisors (see below), whose sum is σ = 78157692. Its totient is φ = 52105120.

The previous prime is 65131393. The next prime is 65131421. The reversal of 65131405 is 50413156.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32114889 + 33016516 = 5667^2 + 5746^2 .

It is not a de Polignac number, because 65131405 - 2⁷ = 65131277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65131405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6513136 + ... + 6513145.

It is an arithmetic number, because the mean of its divisors is an integer number (19539423).

Almost surely, 2^65131405 is an apocalyptic number.

It is an amenable number.

65131405 is a deficient number, since it is larger than the sum of its proper divisors (13026287).

65131405 is a wasteful number, since it uses less digits than its factorization.

65131405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13026286.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 65131405 is about 8070.4030258718. The cubic root of 65131405 is about 402.3433388496.

It can be divided in two parts, 65131 and 405, that added together give a 16-th power (65536 = 2¹⁶).

The spelling of 65131405 in words is "sixty-five million, one hundred thirty-one thousand, four hundred five".