45216947 has 4 divisors (see below), whose sum is σ = 45256416. Its totient is φ = 45177480.

The previous prime is 45216943. The next prime is 45216949. The reversal of 45216947 is 74961254.

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 45216947 - 2² = 45216943 is a prime.

It is an alternating number because its digits alternate between even and odd.

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 45216947.

It is not an unprimeable number, because it can be changed into a prime (45216943) 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, 17963 + ... + 20324.

It is an arithmetic number, because the mean of its divisors is an integer number (11314104).

Almost surely, 2^45216947 is an apocalyptic number.

45216947 is a deficient number, since it is larger than the sum of its proper divisors (39469).

45216947 is a wasteful number, since it uses less digits than its factorization.

45216947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39468.

The product of its digits is 60480, while the sum is 38.

The square root of 45216947 is about 6724.3547645852. The cubic root of 45216947 is about 356.2600123584.

The spelling of 45216947 in words is "forty-five million, two hundred sixteen thousand, nine hundred forty-seven".