1523721605 has 32 divisors (see below), whose sum is σ = 2150758656. Its totient is φ = 1014418944.

The previous prime is 1523721593. The next prime is 1523721607. The reversal of 1523721605 is 5061273251.

It is not a de Polignac number, because 1523721605 - 2⁶ = 1523721541 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 (1523721607) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 798062 + ... + 799968.

It is an arithmetic number, because the mean of its divisors is an integer number (67211208).

Almost surely, 2^1523721605 is an apocalyptic number.

It is an amenable number.

1523721605 is a deficient number, since it is larger than the sum of its proper divisors (627037051).

1523721605 is a wasteful number, since it uses less digits than its factorization.

1523721605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 1523721605 is about 39034.8767770567. The cubic root of 1523721605 is about 1150.7170336126.

Adding to 1523721605 its reverse (5061273251), we get a palindrome (6584994856).

The spelling of 1523721605 in words is "one billion, five hundred twenty-three million, seven hundred twenty-one thousand, six hundred five".