71203961 has 4 divisors (see below), whose sum is σ = 73659300. Its totient is φ = 68748624.

The previous prime is 71203949. The next prime is 71203967. The reversal of 71203961 is 16930217.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58813561 + 12390400 = 7669^2 + 3520^2 .

It is a cyclic number.

It is not a de Polignac number, because 71203961 - 2²⁶ = 4095097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 2455309 = 71203961 / (7 + 1 + 2 + 0 + 3 + 9 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71203967) 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, 1227626 + ... + 1227683.

It is an arithmetic number, because the mean of its divisors is an integer number (18414825).

Almost surely, 2^71203961 is an apocalyptic number.

It is an amenable number.

71203961 is a deficient number, since it is larger than the sum of its proper divisors (2455339).

71203961 is a wasteful number, since it uses less digits than its factorization.

71203961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2455338.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 71203961 is about 8438.2439523873. The cubic root of 71203961 is about 414.4779054082.

The spelling of 71203961 in words is "seventy-one million, two hundred three thousand, nine hundred sixty-one".