1522261661 has 2 divisors, whose sum is σ = 1522261662. Its totient is φ = 1522261660.

The previous prime is 1522261639. The next prime is 1522261667. The reversal of 1522261661 is 1661622251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1166222500 + 356039161 = 34150^2 + 18869^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1522261661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1522261667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 761130830 + 761130831.

It is an arithmetic number, because the mean of its divisors is an integer number (761130831).

Almost surely, 2^1522261661 is an apocalyptic number.

It is an amenable number.

1522261661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1522261661 is an equidigital number, since it uses as much as digits as its factorization.

1522261661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 1522261661 is about 39016.1717881188. The cubic root of 1522261661 is about 1150.3493988111.

The spelling of 1522261661 in words is "one billion, five hundred twenty-two million, two hundred sixty-one thousand, six hundred sixty-one".