5515421999 has 4 divisors (see below), whose sum is σ = 5515686120. Its totient is φ = 5515157880.

The previous prime is 5515421981. The next prime is 5515422001. The reversal of 5515421999 is 9991245155.

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 5515421999 - 2¹² = 5515417903 is a prime.

It is a super-3 number, since 3×5515421999³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5515421939) 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, 97769 + ... + 143490.

It is an arithmetic number, because the mean of its divisors is an integer number (1378921530).

Almost surely, 2^5515421999 is an apocalyptic number.

5515421999 is a deficient number, since it is larger than the sum of its proper divisors (264121).

5515421999 is a wasteful number, since it uses less digits than its factorization.

5515421999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264120.

The product of its digits is 729000, while the sum is 50.

The square root of 5515421999 is about 74265.8871824743. The cubic root of 5515421999 is about 1766.8224773500.

The spelling of 5515421999 in words is "five billion, five hundred fifteen million, four hundred twenty-one thousand, nine hundred ninety-nine".