1521410561 has 6 divisors (see below), whose sum is σ = 1672294386. Its totient is φ = 1383100400.

The previous prime is 1521410549. The next prime is 1521410599. The reversal of 1521410561 is 1650141251.

It can be written as a sum of positive squares in only one way, i.e., 1375000561 + 146410000 = 37081^2 + 12100^2 .

It is not a de Polignac number, because 1521410561 - 2⁶ = 1521410497 is a prime.

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 1521410561.

It is not an unprimeable number, because it can be changed into a prime (1521410861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6286700 + ... + 6286941.

It is an arithmetic number, because the mean of its divisors is an integer number (278715731).

Almost surely, 2^1521410561 is an apocalyptic number.

1521410561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1521410561 is a deficient number, since it is larger than the sum of its proper divisors (150883825).

1521410561 is a wasteful number, since it uses less digits than its factorization.

1521410561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12573663 (or 12573652 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1521410561 is about 39005.2632474132. The cubic root of 1521410561 is about 1150.1349711779.

The spelling of 1521410561 in words is "one billion, five hundred twenty-one million, four hundred ten thousand, five hundred sixty-one".