145561231 has 2 divisors, whose sum is σ = 145561232. Its totient is φ = 145561230.

The previous prime is 145561139. The next prime is 145561279. The reversal of 145561231 is 132165541.

145561231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145561231 - 2¹⁹ = 145036943 is a prime.

It is a super-2 number, since 2×145561231² = 42376143940470722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 145561231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145562231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72780615 + 72780616.

It is an arithmetic number, because the mean of its divisors is an integer number (72780616).

Almost surely, 2^145561231 is an apocalyptic number.

145561231 is a deficient number, since it is larger than the sum of its proper divisors (1).

145561231 is an equidigital number, since it uses as much as digits as its factorization.

145561231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 28.

The square root of 145561231 is about 12064.8759214507. The cubic root of 145561231 is about 526.0357252839.

The spelling of 145561231 in words is "one hundred forty-five million, five hundred sixty-one thousand, two hundred thirty-one".