1522449721 has 4 divisors (see below), whose sum is σ = 1639561252. Its totient is φ = 1405338192.

The previous prime is 1522449707. The next prime is 1522449749. The reversal of 1522449721 is 1279442251.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 999824400 + 522625321 = 31620^2 + 22861^2 .

It is a cyclic number.

It is not a de Polignac number, because 1522449721 - 2¹¹ = 1522447673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1522449121) 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, 58555746 + ... + 58555771.

It is an arithmetic number, because the mean of its divisors is an integer number (409890313).

Almost surely, 2^1522449721 is an apocalyptic number.

It is an amenable number.

1522449721 is a deficient number, since it is larger than the sum of its proper divisors (117111531).

1522449721 is a wasteful number, since it uses less digits than its factorization.

1522449721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117111530.

The product of its digits is 40320, while the sum is 37.

The square root of 1522449721 is about 39018.5817399864. The cubic root of 1522449721 is about 1150.3967681969.

The spelling of 1522449721 in words is "one billion, five hundred twenty-two million, four hundred forty-nine thousand, seven hundred twenty-one".