145621231 has 8 divisors (see below), whose sum is σ = 166709664. Its totient is φ = 124604160.

The previous prime is 145621183. The next prime is 145621237. The reversal of 145621231 is 132126541.

It is a happy number.

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 145621231 - 2⁹ = 145620719 is a prime.

It is a super-2 number, since 2×145621231² = 42411085835910722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145621196 and 145621205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145621237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13390 + ... + 21691.

It is an arithmetic number, because the mean of its divisors is an integer number (20838708).

Almost surely, 2^145621231 is an apocalyptic number.

145621231 is a deficient number, since it is larger than the sum of its proper divisors (21088433).

145621231 is an equidigital number, since it uses as much as digits as its factorization.

145621231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35681.

The product of its digits is 1440, while the sum is 25.

The square root of 145621231 is about 12067.3622221263. The cubic root of 145621231 is about 526.1079922552.

Adding to 145621231 its reverse (132126541), we get a palindrome (277747772).

The spelling of 145621231 in words is "one hundred forty-five million, six hundred twenty-one thousand, two hundred thirty-one".