145213331 has 4 divisors (see below), whose sum is σ = 149897664. Its totient is φ = 140529000.

The previous prime is 145213319. The next prime is 145213361. The reversal of 145213331 is 133312541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133312541 = 113 ⋅1179757.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145213331 is a prime.

It is a super-2 number, since 2×145213331² = 42173823000231122, 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 = 145213297 and 145213306.

It is not an unprimeable number, because it can be changed into a prime (145213361) 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, 2342120 + ... + 2342181.

It is an arithmetic number, because the mean of its divisors is an integer number (37474416).

Almost surely, 2^145213331 is an apocalyptic number.

145213331 is a deficient number, since it is larger than the sum of its proper divisors (4684333).

145213331 is an equidigital number, since it uses as much as digits as its factorization.

145213331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4684332.

The product of its digits is 1080, while the sum is 23.

The square root of 145213331 is about 12050.4494107066. The cubic root of 145213331 is about 525.6163054028.

Adding to 145213331 its reverse (133312541), we get a palindrome (278525872).

The spelling of 145213331 in words is "one hundred forty-five million, two hundred thirteen thousand, three hundred thirty-one".