71651953 has 4 divisors (see below), whose sum is σ = 74122740. Its totient is φ = 69181168.

The previous prime is 71651917. The next prime is 71651963. The reversal of 71651953 is 35915617.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35915617 = 647 ⋅55511.

It can be written as a sum of positive squares in 2 ways, for example, as 39025009 + 32626944 = 6247^2 + 5712^2 .

It is a cyclic number.

It is not a de Polignac number, because 71651953 - 2⁹ = 71651441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71651903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1235350 + ... + 1235407.

It is an arithmetic number, because the mean of its divisors is an integer number (18530685).

Almost surely, 2^71651953 is an apocalyptic number.

It is an amenable number.

71651953 is a deficient number, since it is larger than the sum of its proper divisors (2470787).

71651953 is a wasteful number, since it uses less digits than its factorization.

71651953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470786.

The product of its digits is 28350, while the sum is 37.

The square root of 71651953 is about 8464.7476631025. The cubic root of 71651953 is about 415.3453418085.

The spelling of 71651953 in words is "seventy-one million, six hundred fifty-one thousand, nine hundred fifty-three".