64542169 has 4 divisors (see below), whose sum is σ = 65168896. Its totient is φ = 63915444.

The previous prime is 64542143. The next prime is 64542187. The reversal of 64542169 is 96124546.

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 64542169 - 2²³ = 56153561 is a prime.

It is a super-2 number, since 2×64542169² = 8331383158449122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64542109) 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, 313209 + ... + 313414.

It is an arithmetic number, because the mean of its divisors is an integer number (16292224).

Almost surely, 2^64542169 is an apocalyptic number.

It is an amenable number.

64542169 is a deficient number, since it is larger than the sum of its proper divisors (626727).

64542169 is a wasteful number, since it uses less digits than its factorization.

64542169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626726.

The product of its digits is 51840, while the sum is 37.

The square root of 64542169 is about 8033.8141004133. The cubic root of 64542169 is about 401.1263441452.

The spelling of 64542169 in words is "sixty-four million, five hundred forty-two thousand, one hundred sixty-nine".