53121667 has 4 divisors (see below), whose sum is σ = 53992576. Its totient is φ = 52250760.

The previous prime is 53121661. The next prime is 53121671. The reversal of 53121667 is 76612135.

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

It is a cyclic number.

It is not a de Polignac number, because 53121667 - 2³ = 53121659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53121661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435363 + ... + 435484.

It is an arithmetic number, because the mean of its divisors is an integer number (13498144).

Almost surely, 2^53121667 is an apocalyptic number.

53121667 is a deficient number, since it is larger than the sum of its proper divisors (870909).

53121667 is an equidigital number, since it uses as much as digits as its factorization.

53121667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870908.

The product of its digits is 7560, while the sum is 31.

The square root of 53121667 is about 7288.4612230566. The cubic root of 53121667 is about 375.9157872177.

The spelling of 53121667 in words is "fifty-three million, one hundred twenty-one thousand, six hundred sixty-seven".