55209451 has 4 divisors (see below), whose sum is σ = 60228504. Its totient is φ = 50190400.

The previous prime is 55209437. The next prime is 55209457. The reversal of 55209451 is 15490255.

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 55209451 - 2¹¹ = 55207403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55209457) 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, 2509510 + ... + 2509531.

It is an arithmetic number, because the mean of its divisors is an integer number (15057126).

Almost surely, 2^55209451 is an apocalyptic number.

55209451 is a deficient number, since it is larger than the sum of its proper divisors (5019053).

55209451 is a wasteful number, since it uses less digits than its factorization.

55209451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5019052.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 55209451 is about 7430.3062521002. The cubic root of 55209451 is about 380.7773813559. Note that the first 3 decimals are identical.

The spelling of 55209451 in words is "fifty-five million, two hundred nine thousand, four hundred fifty-one".