145522231 has 2 divisors, whose sum is σ = 145522232. Its totient is φ = 145522230.

The previous prime is 145522217. The next prime is 145522283. The reversal of 145522231 is 132225541.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145522231 - 2²⁵ = 111967799 is a prime.

It is a super-2 number, since 2×145522231² = 42353439430434722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 145522196 and 145522205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145522291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72761115 + 72761116.

It is an arithmetic number, because the mean of its divisors is an integer number (72761116).

Almost surely, 2^145522231 is an apocalyptic number.

145522231 is a deficient number, since it is larger than the sum of its proper divisors (1).

145522231 is an equidigital number, since it uses as much as digits as its factorization.

145522231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 25.

The square root of 145522231 is about 12063.2595512158. The cubic root of 145522231 is about 525.9887411027.

Adding to 145522231 its reverse (132225541), we get a palindrome (277747772).

The spelling of 145522231 in words is "one hundred forty-five million, five hundred twenty-two thousand, two hundred thirty-one".