145961 has 4 divisors (see below), whose sum is σ = 146832. Its totient is φ = 145092.

The previous prime is 145949. The next prime is 145963. The reversal of 145961 is 169541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 169541 = 17 ⋅9973.

It is a cyclic number.

It is not a de Polignac number, because 145961 - 2⁶ = 145897 is a prime.

It is a super-2 number, since 2×145961² = 42609227042, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 145961.

It is not an unprimeable number, because it can be changed into a prime (145963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95 + ... + 548.

It is an arithmetic number, because the mean of its divisors is an integer number (36708).

2¹⁴⁵⁹⁶¹ is an apocalyptic number.

It is an amenable number.

145961 is a deficient number, since it is larger than the sum of its proper divisors (871).

145961 is an equidigital number, since it uses as much as digits as its factorization.

145961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870.

The product of its digits is 1080, while the sum is 26.

The square root of 145961 is about 382.0484262499. The cubic root of 145961 is about 52.6516852829.

The spelling of 145961 in words is "one hundred forty-five thousand, nine hundred sixty-one".