149161 has 2 divisors, whose sum is σ = 149162. Its totient is φ = 149160.

The previous prime is 149159. The next prime is 149173. The reversal of 149161 is 161941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144400 + 4761 = 380^2 + 69^2 .

It is a cyclic number.

It is not a de Polignac number, because 149161 - 2¹ = 149159 is a prime.

Together with 149159, it forms a pair of twin primes.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (149101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74580 + 74581.

It is an arithmetic number, because the mean of its divisors is an integer number (74581).

2¹⁴⁹¹⁶¹ is an apocalyptic number.

It is an amenable number.

149161 is a deficient number, since it is larger than the sum of its proper divisors (1).

149161 is an equidigital number, since it uses as much as digits as its factorization.

149161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 22.

The square root of 149161 is about 386.2136714307. The cubic root of 149161 is about 53.0336797916.

It can be divided in two parts, 1491 and 61, that multiplied together give a triangular number (90951 = T₄₂₆).

The spelling of 149161 in words is "one hundred forty-nine thousand, one hundred sixty-one".