71554649 has 4 divisors (see below), whose sum is σ = 75763764. Its totient is φ = 67345536.

The previous prime is 71554643. The next prime is 71554663. The reversal of 71554649 is 94645517.

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 51912025 + 19642624 = 7205^2 + 4432^2 .

It is a cyclic number.

It is not a de Polignac number, because 71554649 - 2⁸ = 71554393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71554643) by changing a digit.

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, 2104532 + ... + 2104565.

It is an arithmetic number, because the mean of its divisors is an integer number (18940941).

Almost surely, 2^71554649 is an apocalyptic number.

It is an amenable number.

71554649 is a deficient number, since it is larger than the sum of its proper divisors (4209115).

71554649 is a wasteful number, since it uses less digits than its factorization.

71554649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4209114.

The product of its digits is 151200, while the sum is 41.

The square root of 71554649 is about 8458.9981085233. The cubic root of 71554649 is about 415.1572423928.

The spelling of 71554649 in words is "seventy-one million, five hundred fifty-four thousand, six hundred forty-nine".