145220331 has 8 divisors (see below), whose sum is σ = 198130240. Its totient is φ = 94561992.

The previous prime is 145220329. The next prime is 145220333. The reversal of 145220331 is 133022541.

It is an interprime number because it is at equal distance from previous prime (145220329) and next prime (145220333).

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

It is not a de Polignac number, because 145220331 - 2¹ = 145220329 is a prime.

It is a super-2 number, since 2×145220331² = 42177889071499122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 145220298 and 145220307.

It is not an unprimeable number, because it can be changed into a prime (145220333) 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, 562741 + ... + 562998.

It is an arithmetic number, because the mean of its divisors is an integer number (24766280).

Almost surely, 2^145220331 is an apocalyptic number.

145220331 is a deficient number, since it is larger than the sum of its proper divisors (52909909).

145220331 is a wasteful number, since it uses less digits than its factorization.

145220331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125785.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 145220331 is about 12050.7398528057. The cubic root of 145220331 is about 525.6247510347.

Adding to 145220331 its reverse (133022541), we get a palindrome (278242872).

The spelling of 145220331 in words is "one hundred forty-five million, two hundred twenty thousand, three hundred thirty-one".