971487509 has 8 divisors (see below), whose sum is σ = 1010880000. Its totient is φ = 932875216.

The previous prime is 971487493. The next prime is 971487523. The reversal of 971487509 is 905784179.

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 971487509 - 2⁴ = 971487493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971487529) 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, 192509 + ... + 197490.

It is an arithmetic number, because the mean of its divisors is an integer number (126360000).

Almost surely, 2^971487509 is an apocalyptic number.

It is an amenable number.

971487509 is a deficient number, since it is larger than the sum of its proper divisors (39392491).

971487509 is a wasteful number, since it uses less digits than its factorization.

971487509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390099.

The product of its (nonzero) digits is 635040, while the sum is 50.

The square root of 971487509 is about 31168.6943743237. The cubic root of 971487509 is about 990.4040485889.

The spelling of 971487509 in words is "nine hundred seventy-one million, four hundred eighty-seven thousand, five hundred nine".