71197961 has 4 divisors (see below), whose sum is σ = 71232000. Its totient is φ = 71163924.

The previous prime is 71197943. The next prime is 71197963. The reversal of 71197961 is 16979117.

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: 16979117 = 673 ⋅25229.

It is a cyclic number.

It is not a de Polignac number, because 71197961 - 2⁶ = 71197897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71197963) 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, 13661 + ... + 18138.

It is an arithmetic number, because the mean of its divisors is an integer number (17808000).

Almost surely, 2^71197961 is an apocalyptic number.

It is an amenable number.

71197961 is a deficient number, since it is larger than the sum of its proper divisors (34039).

71197961 is a wasteful number, since it uses less digits than its factorization.

71197961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34038.

The product of its digits is 23814, while the sum is 41.

The square root of 71197961 is about 8437.8884206891. Note that the first 3 decimals coincide. The cubic root of 71197961 is about 414.4662630910.

The spelling of 71197961 in words is "seventy-one million, one hundred ninety-seven thousand, nine hundred sixty-one".