71703561 has 4 divisors (see below), whose sum is σ = 95604752. Its totient is φ = 47802372.

The previous prime is 71703559. The next prime is 71703607. The reversal of 71703561 is 16530717.

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 not a de Polignac number, because 71703561 - 2¹ = 71703559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71703551) 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, 11950591 + ... + 11950596.

It is an arithmetic number, because the mean of its divisors is an integer number (23901188).

Almost surely, 2^71703561 is an apocalyptic number.

It is an amenable number.

71703561 is a deficient number, since it is larger than the sum of its proper divisors (23901191).

71703561 is a wasteful number, since it uses less digits than its factorization.

71703561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23901190.

The product of its (nonzero) digits is 4410, while the sum is 30.

The square root of 71703561 is about 8467.7955218581. The cubic root of 71703561 is about 415.4450366867.

It can be divided in two parts, 7170 and 3561, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 71703561 in words is "seventy-one million, seven hundred three thousand, five hundred sixty-one".