145831 has 8 divisors (see below), whose sum is σ = 169344. Its totient is φ = 123000.

The previous prime is 145829. The next prime is 145861. The reversal of 145831 is 138541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145831 - 2¹ = 145829 is a prime.

It is a super-2 number, since 2×145831² = 42533361122, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456 + ... + 706.

It is an arithmetic number, because the mean of its divisors is an integer number (21168).

2¹⁴⁵⁸³¹ is an apocalyptic number.

145831 is a deficient number, since it is larger than the sum of its proper divisors (23513).

145831 is an equidigital number, since it uses as much as digits as its factorization.

145831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341.

The product of its digits is 480, while the sum is 22.

The square root of 145831 is about 381.8782528503. The cubic root of 145831 is about 52.6360492519.

The spelling of 145831 in words is "one hundred forty-five thousand, eight hundred thirty-one".