521214987 has 8 divisors (see below), whose sum is σ = 695305936. Its totient is φ = 347300352.

The previous prime is 521214979. The next prime is 521214989. The reversal of 521214987 is 789412125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 521214987 - 2³ = 521214979 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521214989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37018 + ... + 49119.

It is an arithmetic number, because the mean of its divisors is an integer number (86913242).

Almost surely, 2^521214987 is an apocalyptic number.

521214987 is a deficient number, since it is larger than the sum of its proper divisors (174090949).

521214987 is a wasteful number, since it uses less digits than its factorization.

521214987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88157.

The product of its digits is 40320, while the sum is 39.

The square root of 521214987 is about 22830.1333110431. The cubic root of 521214987 is about 804.7709632223.

The spelling of 521214987 in words is "five hundred twenty-one million, two hundred fourteen thousand, nine hundred eighty-seven".