1601135761 has 2 divisors, whose sum is σ = 1601135762. Its totient is φ = 1601135760.

The previous prime is 1601135741. The next prime is 1601135881. The reversal of 1601135761 is 1675311061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1061456400 + 539679361 = 32580^2 + 23231^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1601135761 is a prime.

It is not a weakly prime, because it can be changed into another prime (1601135741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800567880 + 800567881.

It is an arithmetic number, because the mean of its divisors is an integer number (800567881).

Almost surely, 2^1601135761 is an apocalyptic number.

It is an amenable number.

1601135761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601135761 is an equidigital number, since it uses as much as digits as its factorization.

1601135761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 1601135761 is about 40014.1944939543. The cubic root of 1601135761 is about 1169.8837786034.

The spelling of 1601135761 in words is "one billion, six hundred one million, one hundred thirty-five thousand, seven hundred sixty-one".