1521610641 has 24 divisors (see below), whose sum is σ = 2211414816. Its totient is φ = 1008184320.

The previous prime is 1521610577. The next prime is 1521610667. The reversal of 1521610641 is 1460161251.

1521610641 is a `hidden beast` number, since 1 + 5 + 2 + 1 + 6 + 10 + 641 = 666.

It is not a de Polignac number, because 1521610641 - 2⁶ = 1521610577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1521610691) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1319121 + ... + 1320273.

It is an arithmetic number, because the mean of its divisors is an integer number (92142284).

Almost surely, 2^1521610641 is an apocalyptic number.

It is an amenable number.

1521610641 is a deficient number, since it is larger than the sum of its proper divisors (689804175).

1521610641 is a wasteful number, since it uses less digits than its factorization.

1521610641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933 (or 1930 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1521610641 is about 39007.8279451702. The cubic root of 1521610641 is about 1150.1853868741.

Adding to 1521610641 its reverse (1460161251), we get a palindrome (2981771892).

It can be divided in two parts, 1521610 and 641, that added together give a palindrome (1522251).

The spelling of 1521610641 in words is "one billion, five hundred twenty-one million, six hundred ten thousand, six hundred forty-one".