65131449 has 16 divisors (see below), whose sum is σ = 91586880. Its totient is φ = 41057280.

The previous prime is 65131447. The next prime is 65131453. The reversal of 65131449 is 94413156.

It is not a de Polignac number, because 65131449 - 2¹ = 65131447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65131441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49569 + ... + 50865.

It is an arithmetic number, because the mean of its divisors is an integer number (5724180).

Almost surely, 2^65131449 is an apocalyptic number.

It is an amenable number.

65131449 is a deficient number, since it is larger than the sum of its proper divisors (26455431).

65131449 is a wasteful number, since it uses less digits than its factorization.

65131449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2200.

The product of its digits is 12960, while the sum is 33.

The square root of 65131449 is about 8070.4057518814. The cubic root of 65131449 is about 402.3434294516.

The spelling of 65131449 in words is "sixty-five million, one hundred thirty-one thousand, four hundred forty-nine".