45252721 has 8 divisors (see below), whose sum is σ = 45672704. Its totient is φ = 44835120.

The previous prime is 45252719. The next prime is 45252749. The reversal of 45252721 is 12725254.

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

It is a cyclic number.

It is not a de Polignac number, because 45252721 - 2¹ = 45252719 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 45252721.

It is not an unprimeable number, because it can be changed into a prime (45252751) 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, 68131 + ... + 68791.

It is an arithmetic number, because the mean of its divisors is an integer number (5709088).

Almost surely, 2^45252721 is an apocalyptic number.

It is an amenable number.

45252721 is a deficient number, since it is larger than the sum of its proper divisors (419983).

45252721 is a wasteful number, since it uses less digits than its factorization.

45252721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191.

The product of its digits is 5600, while the sum is 28.

The square root of 45252721 is about 6727.0142708337. The cubic root of 45252721 is about 356.3539409030.

Adding to 45252721 its reverse (12725254), we get a palindrome (57977975).

The spelling of 45252721 in words is "forty-five million, two hundred fifty-two thousand, seven hundred twenty-one".