71671537 has 4 divisors (see below), whose sum is σ = 81910336. Its totient is φ = 61432740.

The previous prime is 71671517. The next prime is 71671547. The reversal of 71671537 is 73517617.

It is a happy number.

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 71671537 - 2⁷ = 71671409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71671496 and 71671505.

It is not an unprimeable number, because it can be changed into a prime (71671517) 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, 5119389 + ... + 5119402.

It is an arithmetic number, because the mean of its divisors is an integer number (20477584).

Almost surely, 2^71671537 is an apocalyptic number.

It is an amenable number.

71671537 is a deficient number, since it is larger than the sum of its proper divisors (10238799).

71671537 is a wasteful number, since it uses less digits than its factorization.

71671537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10238798.

The product of its digits is 30870, while the sum is 37.

The square root of 71671537 is about 8465.9043816948. The cubic root of 71671537 is about 415.3831792615.

The spelling of 71671537 in words is "seventy-one million, six hundred seventy-one thousand, five hundred thirty-seven".