145631 has 4 divisors (see below), whose sum is σ = 146832. Its totient is φ = 144432.

The previous prime is 145603. The next prime is 145633. The reversal of 145631 is 136541.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145631 is a prime.

It is a super-2 number, since 2×145631² = 42416776322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145633) 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, 395 + ... + 668.

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

2¹⁴⁵⁶³¹ is an apocalyptic number.

145631 is a deficient number, since it is larger than the sum of its proper divisors (1201).

145631 is a wasteful number, since it uses less digits than its factorization.

145631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200.

The product of its digits is 360, while the sum is 20.

The square root of 145631 is about 381.6162994423. The cubic root of 145631 is about 52.6119756643.

The spelling of 145631 in words is "one hundred forty-five thousand, six hundred thirty-one".