52661999 has 16 divisors (see below), whose sum is σ = 60117120. Its totient is φ = 45776640.

The previous prime is 52661993. The next prime is 52662007. The reversal of 52661999 is 99916625.

It is not a de Polignac number, because 52661999 - 2²⁰ = 51613423 is a prime.

It is a super-2 number, since 2×52661999² = 5546572277352002, which contains 22 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 (52661993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13754 + ... + 17160.

It is an arithmetic number, because the mean of its divisors is an integer number (3757320).

Almost surely, 2^52661999 is an apocalyptic number.

52661999 is a deficient number, since it is larger than the sum of its proper divisors (7455121).

52661999 is a wasteful number, since it uses less digits than its factorization.

52661999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3490.

The product of its digits is 262440, while the sum is 47.

The square root of 52661999 is about 7256.8587556876. The cubic root of 52661999 is about 374.8283635285.

The spelling of 52661999 in words is "fifty-two million, six hundred sixty-one thousand, nine hundred ninety-nine".