161126557 has 2 divisors, whose sum is σ = 161126558. Its totient is φ = 161126556.

The previous prime is 161126543. The next prime is 161126591. The reversal of 161126557 is 755621161.

161126557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (161126591) can be obtained adding 161126557 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159112996 + 2013561 = 12614^2 + 1419^2 .

It is an emirp because it is prime and its reverse (755621161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161126557 - 2¹⁵ = 161093789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161126507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80563278 + 80563279.

It is an arithmetic number, because the mean of its divisors is an integer number (80563279).

Almost surely, 2^161126557 is an apocalyptic number.

It is an amenable number.

161126557 is a deficient number, since it is larger than the sum of its proper divisors (1).

161126557 is an equidigital number, since it uses as much as digits as its factorization.

161126557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 34.

The square root of 161126557 is about 12693.5636052292. The cubic root of 161126557 is about 544.1546887895.

The spelling of 161126557 in words is "one hundred sixty-one million, one hundred twenty-six thousand, five hundred fifty-seven".