1521522461 has 2 divisors, whose sum is σ = 1521522462. Its totient is φ = 1521522460.

The previous prime is 1521522433. The next prime is 1521522467. The reversal of 1521522461 is 1642251251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1342123225 + 179399236 = 36635^2 + 13394^2 .

It is an emirp because it is prime and its reverse (1642251251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1521522461 - 2⁶ = 1521522397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1521522467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760761230 + 760761231.

It is an arithmetic number, because the mean of its divisors is an integer number (760761231).

Almost surely, 2^1521522461 is an apocalyptic number.

It is an amenable number.

1521522461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1521522461 is an equidigital number, since it uses as much as digits as its factorization.

1521522461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 29.

The square root of 1521522461 is about 39006.6976428408. The cubic root of 1521522461 is about 1150.1631680261.

The spelling of 1521522461 in words is "one billion, five hundred twenty-one million, five hundred twenty-two thousand, four hundred sixty-one".