65449381 has 4 divisors (see below), whose sum is σ = 65815200. Its totient is φ = 65083564.

The previous prime is 65449379. The next prime is 65449387. The reversal of 65449381 is 18394456.

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 65449381 - 2¹ = 65449379 is a prime.

It is a super-2 number, since 2×65449381² = 8567242946566322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65449387) 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, 182641 + ... + 182998.

It is an arithmetic number, because the mean of its divisors is an integer number (16453800).

Almost surely, 2^65449381 is an apocalyptic number.

It is an amenable number.

65449381 is a deficient number, since it is larger than the sum of its proper divisors (365819).

65449381 is a wasteful number, since it uses less digits than its factorization.

65449381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365818.

The product of its digits is 103680, while the sum is 40.

The square root of 65449381 is about 8090.0791714297. The cubic root of 65449381 is about 402.9970321623.

The spelling of 65449381 in words is "sixty-five million, four hundred forty-nine thousand, three hundred eighty-one".