117021487 has 4 divisors (see below), whose sum is σ = 127659816. Its totient is φ = 106383160.

The previous prime is 117021473. The next prime is 117021517. The reversal of 117021487 is 784120711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 784120711 = 11 ⋅71283701.

It is a cyclic number.

It is not a de Polignac number, because 117021487 - 2¹¹ = 117019439 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117021407) 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, 5319148 + ... + 5319169.

It is an arithmetic number, because the mean of its divisors is an integer number (31914954).

Almost surely, 2^117021487 is an apocalyptic number.

117021487 is a deficient number, since it is larger than the sum of its proper divisors (10638329).

117021487 is a wasteful number, since it uses less digits than its factorization.

117021487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10638328.

The product of its (nonzero) digits is 3136, while the sum is 31.

The square root of 117021487 is about 10817.6470177206. The cubic root of 117021487 is about 489.1272636564.

The spelling of 117021487 in words is "one hundred seventeen million, twenty-one thousand, four hundred eighty-seven".