71772081 has 4 divisors (see below), whose sum is σ = 95696112. Its totient is φ = 47848052.

The previous prime is 71772061. The next prime is 71772083. The reversal of 71772081 is 18027717.

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 71772081 - 2⁵ = 71772049 is a prime.

It is a super-2 number, since 2×71772081² = 10302463222141122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71772083) 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, 11962011 + ... + 11962016.

It is an arithmetic number, because the mean of its divisors is an integer number (23924028).

Almost surely, 2^71772081 is an apocalyptic number.

It is an amenable number.

71772081 is a deficient number, since it is larger than the sum of its proper divisors (23924031).

71772081 is a wasteful number, since it uses less digits than its factorization.

71772081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23924030.

The product of its (nonzero) digits is 5488, while the sum is 33.

The square root of 71772081 is about 8471.8404730023. The cubic root of 71772081 is about 415.5773277977.

Adding to 71772081 its reverse (18027717), we get a palindrome (89799798).

The spelling of 71772081 in words is "seventy-one million, seven hundred seventy-two thousand, eighty-one".