1522261561 has 2 divisors, whose sum is σ = 1522261562. Its totient is φ = 1522261560.

The previous prime is 1522261553. The next prime is 1522261567. The reversal of 1522261561 is 1651622251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1031373225 + 490888336 = 32115^2 + 22156^2 .

It is an emirp because it is prime and its reverse (1651622251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1522261561 - 2³ = 1522261553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1522261567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 761130780 + 761130781.

It is an arithmetic number, because the mean of its divisors is an integer number (761130781).

Almost surely, 2^1522261561 is an apocalyptic number.

It is an amenable number.

1522261561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1522261561 is an equidigital number, since it uses as much as digits as its factorization.

1522261561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 1522261561 is about 39016.1705065989. The cubic root of 1522261561 is about 1150.3493736216.

The spelling of 1522261561 in words is "one billion, five hundred twenty-two million, two hundred sixty-one thousand, five hundred sixty-one".