1161505601 has 2 divisors, whose sum is σ = 1161505602. Its totient is φ = 1161505600.

The previous prime is 1161505577. The next prime is 1161505607. The reversal of 1161505601 is 1065051611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1046587201 + 114918400 = 32351^2 + 10720^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161505601 - 2⁶ = 1161505537 is a prime.

It is a super-2 number, since 2×1161505601² = 2698190522308742402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1161505607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580752800 + 580752801.

It is an arithmetic number, because the mean of its divisors is an integer number (580752801).

Almost surely, 2^1161505601 is an apocalyptic number.

It is an amenable number.

1161505601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161505601 is an equidigital number, since it uses as much as digits as its factorization.

1161505601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 1161505601 is about 34080.8685482046. The cubic root of 1161505601 is about 1051.1719645842.

The spelling of 1161505601 in words is "one billion, one hundred sixty-one million, five hundred five thousand, six hundred one".