71561069 has 4 divisors (see below), whose sum is σ = 71876544. Its totient is φ = 71245596.

The previous prime is 71561029. The next prime is 71561081. The reversal of 71561069 is 96016517.

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 a cyclic number.

It is not a de Polignac number, because 71561069 - 2¹² = 71556973 is a prime.

It is a super-2 number, since 2×71561069² = 10241973192845522, 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 (71561029) 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, 157397 + ... + 157850.

It is an arithmetic number, because the mean of its divisors is an integer number (17969136).

Almost surely, 2^71561069 is an apocalyptic number.

It is an amenable number.

71561069 is a deficient number, since it is larger than the sum of its proper divisors (315475).

71561069 is a wasteful number, since it uses less digits than its factorization.

71561069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315474.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 71561069 is about 8459.3775775763. The cubic root of 71561069 is about 415.1696582168.

The spelling of 71561069 in words is "seventy-one million, five hundred sixty-one thousand, sixty-nine".