45545551 has 4 divisors (see below), whose sum is σ = 45718992. Its totient is φ = 45372112.

The previous prime is 45545531. The next prime is 45545561. The reversal of 45545551 is 15554554.

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 45545551 - 2⁵ = 45545519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45545501) 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, 86326 + ... + 86851.

It is an arithmetic number, because the mean of its divisors is an integer number (11429748).

Almost surely, 2^45545551 is an apocalyptic number.

45545551 is a deficient number, since it is larger than the sum of its proper divisors (173441).

45545551 is a wasteful number, since it uses less digits than its factorization.

45545551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173440.

The product of its digits is 50000, while the sum is 34.

The square root of 45545551 is about 6748.7444017387. The cubic root of 45545551 is about 357.1209433640.

The spelling of 45545551 in words is "forty-five million, five hundred forty-five thousand, five hundred fifty-one".