145247331 has 4 divisors (see below), whose sum is σ = 193663112. Its totient is φ = 96831552.

The previous prime is 145247329. The next prime is 145247339. The reversal of 145247331 is 133742541.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133742541 = 3 ⋅44580847.

It is not a de Polignac number, because 145247331 - 2¹ = 145247329 is a prime.

It is a super-2 number, since 2×145247331² = 42193574325247122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145247339) 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, 24207886 + ... + 24207891.

It is an arithmetic number, because the mean of its divisors is an integer number (48415778).

Almost surely, 2^145247331 is an apocalyptic number.

145247331 is a deficient number, since it is larger than the sum of its proper divisors (48415781).

145247331 is an equidigital number, since it uses as much as digits as its factorization.

145247331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48415780.

The product of its digits is 10080, while the sum is 30.

The square root of 145247331 is about 12051.8600639071. The cubic root of 145247331 is about 525.6573245014.

Adding to 145247331 its reverse (133742541), we get a palindrome (278989872).

The spelling of 145247331 in words is "one hundred forty-five million, two hundred forty-seven thousand, three hundred thirty-one".