145261 has 4 divisors (see below), whose sum is σ = 150300.
Its totient is φ = 140224.
The previous prime is 145259. The next prime is 145267. The reversal of 145261 is 162541.
It can be divided in two parts, 145 and 261, that added together give a triangular number (406 = T28).
145261 = 2692 + 2702.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 72361 + 72900 = 269^2 + 270^2
It is a cyclic number.
It is not a de Polignac number, because 145261 - 21 = 145259 is a prime.
It is a super-2 number, since 2×1452612 = 42201516242, which contains 22 as substring.
It is a Duffinian number.
145261 is a modest number, since divided by 261 gives 145 as remainder.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (145267) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2476 + ... + 2533.
It is an arithmetic number, because the mean of its divisors is an integer number (37575).
2145261 is an apocalyptic number.
145261 is the 270-th centered square number.
It is an amenable number.
145261 is a deficient number, since it is larger than the sum of its proper divisors (5039).
145261 is an equidigital number, since it uses as much as digits as its factorization.
145261 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5038.
The product of its digits is 240, while the sum is 19.
The square root of 145261 is about 381.1312110022.
The cubic root of 145261 is about 52.5673813581.
The spelling of 145261 in words is "one hundred forty-five thousand, two hundred sixty-one".