45217491 has 8 divisors (see below), whose sum is σ = 65770944. Its totient is φ = 27404520.

The previous prime is 45217489. The next prime is 45217519. The reversal of 45217491 is 19471254.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 45217491 - 2¹ = 45217489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 1370227 = 45217491 / (4 + 5 + 2 + 1 + 7 + 4 + 9 + 1).

It is not an unprimeable number, because it can be changed into a prime (45217411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 685081 + ... + 685146.

It is an arithmetic number, because the mean of its divisors is an integer number (8221368).

Almost surely, 2^45217491 is an apocalyptic number.

45217491 is a deficient number, since it is larger than the sum of its proper divisors (20553453).

45217491 is a wasteful number, since it uses less digits than its factorization.

45217491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370241.

The product of its digits is 10080, while the sum is 33.

The square root of 45217491 is about 6724.3952144412. The cubic root of 45217491 is about 356.2614410607.

The spelling of 45217491 in words is "forty-five million, two hundred seventeen thousand, four hundred ninety-one".