1522651661 has 2 divisors, whose sum is σ = 1522651662. Its totient is φ = 1522651660.

The previous prime is 1522651651. The next prime is 1522651667. The reversal of 1522651661 is 1661562251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 966588100 + 556063561 = 31090^2 + 23581^2 .

It is a cyclic number.

It is not a de Polignac number, because 1522651661 - 2²⁶ = 1455542797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1522651667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 761325830 + 761325831.

It is an arithmetic number, because the mean of its divisors is an integer number (761325831).

Almost surely, 2^1522651661 is an apocalyptic number.

It is an amenable number.

1522651661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1522651661 is an equidigital number, since it uses as much as digits as its factorization.

1522651661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 35.

The square root of 1522651661 is about 39021.1693955986. The cubic root of 1522651661 is about 1150.4476293955.

The spelling of 1522651661 in words is "one billion, five hundred twenty-two million, six hundred fifty-one thousand, six hundred sixty-one".