64981149 has 4 divisors (see below), whose sum is σ = 86641536. Its totient is φ = 43320764.

The previous prime is 64981129. The next prime is 64981211. The reversal of 64981149 is 94118946.

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 64981149 - 2¹⁷ = 64850077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64981149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64981129) 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, 10830189 + ... + 10830194.

It is an arithmetic number, because the mean of its divisors is an integer number (21660384).

Almost surely, 2^64981149 is an apocalyptic number.

It is an amenable number.

64981149 is a deficient number, since it is larger than the sum of its proper divisors (21660387).

64981149 is a wasteful number, since it uses less digits than its factorization.

64981149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21660386.

The product of its digits is 62208, while the sum is 42.

The square root of 64981149 is about 8061.0885741319. The cubic root of 64981149 is about 402.0337030232.

The spelling of 64981149 in words is "sixty-four million, nine hundred eighty-one thousand, one hundred forty-nine".