71951623 has 4 divisors (see below), whose sum is σ = 72393208. Its totient is φ = 71510040.

The previous prime is 71951611. The next prime is 71951629. The reversal of 71951623 is 32615917.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32615917 = 647 ⋅50411.

It is a cyclic number.

It is not a de Polignac number, because 71951623 - 2⁵ = 71951591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71951629) 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, 220548 + ... + 220873.

It is an arithmetic number, because the mean of its divisors is an integer number (18098302).

Almost surely, 2^71951623 is an apocalyptic number.

71951623 is a deficient number, since it is larger than the sum of its proper divisors (441585).

71951623 is a wasteful number, since it uses less digits than its factorization.

71951623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441584.

The product of its digits is 11340, while the sum is 34.

The square root of 71951623 is about 8482.4302531763. The cubic root of 71951623 is about 415.9235694613.

The spelling of 71951623 in words is "seventy-one million, nine hundred fifty-one thousand, six hundred twenty-three".