1353121661 has 2 divisors, whose sum is σ = 1353121662. Its totient is φ = 1353121660.

The previous prime is 1353121657. The next prime is 1353121691. The reversal of 1353121661 is 1661213531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1178617561 + 174504100 = 34331^2 + 13210^2 .

It is a cyclic number.

It is not a de Polignac number, because 1353121661 - 2² = 1353121657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1353121631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 676560830 + 676560831.

It is an arithmetic number, because the mean of its divisors is an integer number (676560831).

Almost surely, 2^1353121661 is an apocalyptic number.

It is an amenable number.

1353121661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1353121661 is an equidigital number, since it uses as much as digits as its factorization.

1353121661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 1353121661 is about 36784.8020383419. The cubic root of 1353121661 is about 1106.0606677119.

The spelling of 1353121661 in words is "one billion, three hundred fifty-three million, one hundred twenty-one thousand, six hundred sixty-one".