71187069 has 4 divisors (see below), whose sum is σ = 94916096. Its totient is φ = 47458044.

The previous prime is 71187049. The next prime is 71187071. The reversal of 71187069 is 96078117.

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 not a de Polignac number, because 71187069 - 2⁸ = 71186813 is a prime.

It is a super-2 number, since 2×71187069² = 10135197585621522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71187019) 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, 11864509 + ... + 11864514.

It is an arithmetic number, because the mean of its divisors is an integer number (23729024).

Almost surely, 2^71187069 is an apocalyptic number.

It is an amenable number.

71187069 is a deficient number, since it is larger than the sum of its proper divisors (23729027).

71187069 is a wasteful number, since it uses less digits than its factorization.

71187069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23729026.

The product of its (nonzero) digits is 21168, while the sum is 39.

The square root of 71187069 is about 8437.2429738630. The cubic root of 71187069 is about 414.4451267331.

The spelling of 71187069 in words is "seventy-one million, one hundred eighty-seven thousand, sixty-nine".