161134261 has 2 divisors, whose sum is σ = 161134262. Its totient is φ = 161134260.

The previous prime is 161134243. The next prime is 161134301. The reversal of 161134261 is 162431161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158004900 + 3129361 = 12570^2 + 1769^2 .

It is an emirp because it is prime and its reverse (162431161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161134261 - 2⁵ = 161134229 is a prime.

It is a super-2 number, since 2×161134261² = 51928500136032242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161134241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80567130 + 80567131.

It is an arithmetic number, because the mean of its divisors is an integer number (80567131).

Almost surely, 2^161134261 is an apocalyptic number.

It is an amenable number.

161134261 is a deficient number, since it is larger than the sum of its proper divisors (1).

161134261 is an equidigital number, since it uses as much as digits as its factorization.

161134261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 161134261 is about 12693.8670624834. The cubic root of 161134261 is about 544.1633612702.

The spelling of 161134261 in words is "one hundred sixty-one million, one hundred thirty-four thousand, two hundred sixty-one".