55952009 has 4 divisors (see below), whose sum is σ = 56392704. Its totient is φ = 55511316.

The previous prime is 55951997. The next prime is 55952021. The reversal of 55952009 is 90025955.

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 an interprime number because it is at equal distance from previous prime (55951997) and next prime (55952021).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55952009 is a prime.

It is a super-2 number, since 2×55952009² = 6261254622272162, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55952009.

It is not an unprimeable number, because it can be changed into a prime (55952069) 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, 220157 + ... + 220410.

It is an arithmetic number, because the mean of its divisors is an integer number (14098176).

Almost surely, 2^55952009 is an apocalyptic number.

It is an amenable number.

55952009 is a deficient number, since it is larger than the sum of its proper divisors (440695).

55952009 is a wasteful number, since it uses less digits than its factorization.

55952009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440694.

The product of its (nonzero) digits is 20250, while the sum is 35.

The square root of 55952009 is about 7480.1075527027. The cubic root of 55952009 is about 382.4769154622.

The spelling of 55952009 in words is "fifty-five million, nine hundred fifty-two thousand, nine".