71561123 has 8 divisors (see below), whose sum is σ = 72622080. Its totient is φ = 70504200.

The previous prime is 71561117. The next prime is 71561131. The reversal of 71561123 is 32116517.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71561123 - 2⁴ = 71561107 is a prime.

It is a super-2 number, since 2×71561123² = 10241988650042258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71561092 and 71561101.

It is not an unprimeable number, because it can be changed into a prime (71561323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61598 + ... + 62748.

It is an arithmetic number, because the mean of its divisors is an integer number (9077760).

Almost surely, 2^71561123 is an apocalyptic number.

71561123 is a deficient number, since it is larger than the sum of its proper divisors (1060957).

71561123 is a wasteful number, since it uses less digits than its factorization.

71561123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2017.

The product of its digits is 1260, while the sum is 26.

The square root of 71561123 is about 8459.3807692998. The cubic root of 71561123 is about 415.1697626458.

The spelling of 71561123 in words is "seventy-one million, five hundred sixty-one thousand, one hundred twenty-three".