145120331 has 4 divisors (see below), whose sum is σ = 149801664. Its totient is φ = 140439000.

The previous prime is 145120301. The next prime is 145120333. The reversal of 145120331 is 133021541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133021541 = 61 ⋅2180681.

It is a cyclic number.

It is not a de Polignac number, because 145120331 - 2⁶ = 145120267 is a prime.

It is a super-2 number, since 2×145120331² = 42119820939099122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145120333) 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 3 ways as a sum of consecutive naturals, for example, 2340620 + ... + 2340681.

It is an arithmetic number, because the mean of its divisors is an integer number (37450416).

Almost surely, 2^145120331 is an apocalyptic number.

145120331 is a deficient number, since it is larger than the sum of its proper divisors (4681333).

145120331 is an equidigital number, since it uses as much as digits as its factorization.

145120331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4681332.

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

The square root of 145120331 is about 12046.5900154359. The cubic root of 145120331 is about 525.5040733850.

Adding to 145120331 its reverse (133021541), we get a palindrome (278141872).

The spelling of 145120331 in words is "one hundred forty-five million, one hundred twenty thousand, three hundred thirty-one".