1161664129 has 2 divisors, whose sum is σ = 1161664130. Its totient is φ = 1161664128.

The previous prime is 1161664117. The next prime is 1161664159. The reversal of 1161664129 is 9214661611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 820707904 + 340956225 = 28648^2 + 18465^2 .

It is an emirp because it is prime and its reverse (9214661611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1161664129 - 2²³ = 1153275521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1161664159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580832064 + 580832065.

It is an arithmetic number, because the mean of its divisors is an integer number (580832065).

Almost surely, 2^1161664129 is an apocalyptic number.

It is an amenable number.

1161664129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161664129 is an equidigital number, since it uses as much as digits as its factorization.

1161664129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 1161664129 is about 34083.1942311750. The cubic root of 1161664129 is about 1051.2197854494.

It can be divided in two parts, 116166 and 4129, that added together give a triangular number (120295 = T₄₉₀).

The spelling of 1161664129 in words is "one billion, one hundred sixty-one million, six hundred sixty-four thousand, one hundred twenty-nine".