71951621 has 16 divisors (see below), whose sum is σ = 84672000. Its totient is φ = 59868528.

The previous prime is 71951611. The next prime is 71951629. The reversal of 71951621 is 12615917.

It is a cyclic number.

It is not a de Polignac number, because 71951621 - 2¹⁸ = 71689477 is a prime.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33230 + ... + 35328.

It is an arithmetic number, because the mean of its divisors is an integer number (5292000).

Almost surely, 2^71951621 is an apocalyptic number.

It is an amenable number.

71951621 is a deficient number, since it is larger than the sum of its proper divisors (12720379).

71951621 is a wasteful number, since it uses less digits than its factorization.

71951621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2248.

The product of its digits is 3780, while the sum is 32.

The square root of 71951621 is about 8482.4301352855. The cubic root of 71951621 is about 415.9235656076.

The spelling of 71951621 in words is "seventy-one million, nine hundred fifty-one thousand, six hundred twenty-one".