71192989 has 4 divisors (see below), whose sum is σ = 81363424. Its totient is φ = 61022556.

The previous prime is 71192987. The next prime is 71193029. The reversal of 71192989 is 98929117.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98929117 = 7 ⋅14132731.

It is not a de Polignac number, because 71192989 - 2¹ = 71192987 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 (71192987) 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, 5085207 + ... + 5085220.

It is an arithmetic number, because the mean of its divisors is an integer number (20340856).

Almost surely, 2^71192989 is an apocalyptic number.

It is an amenable number.

71192989 is a deficient number, since it is larger than the sum of its proper divisors (10170435).

71192989 is a wasteful number, since it uses less digits than its factorization.

71192989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10170434.

The product of its digits is 81648, while the sum is 46.

The square root of 71192989 is about 8437.5937920713. The cubic root of 71192989 is about 414.4566149953.

The spelling of 71192989 in words is "seventy-one million, one hundred ninety-two thousand, nine hundred eighty-nine".