71121923 has 4 divisors (see below), whose sum is σ = 71398920. Its totient is φ = 70844928.

The previous prime is 71121901. The next prime is 71121961. The reversal of 71121923 is 32912117.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32912117 = 7 ⋅4701731.

It is a cyclic number.

It is not a de Polignac number, because 71121923 - 2⁸ = 71121667 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71121892 and 71121901.

It is not an unprimeable number, because it can be changed into a prime (71121983) 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, 138113 + ... + 138626.

It is an arithmetic number, because the mean of its divisors is an integer number (17849730).

Almost surely, 2^71121923 is an apocalyptic number.

71121923 is a deficient number, since it is larger than the sum of its proper divisors (276997).

71121923 is a wasteful number, since it uses less digits than its factorization.

71121923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276996.

The product of its digits is 756, while the sum is 26.

The square root of 71121923 is about 8433.3814689008. The cubic root of 71121923 is about 414.3186633043.

The spelling of 71121923 in words is "seventy-one million, one hundred twenty-one thousand, nine hundred twenty-three".