145456331 has 2 divisors, whose sum is σ = 145456332. Its totient is φ = 145456330.

The previous prime is 145456319. The next prime is 145456387. The reversal of 145456331 is 133654541.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145456331 is a prime.

It is a super-2 number, since 2×145456331² = 42315088455963122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145456231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72728165 + 72728166.

It is an arithmetic number, because the mean of its divisors is an integer number (72728166).

Almost surely, 2^145456331 is an apocalyptic number.

145456331 is a deficient number, since it is larger than the sum of its proper divisors (1).

145456331 is an equidigital number, since it uses as much as digits as its factorization.

145456331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 32.

The square root of 145456331 is about 12060.5278076874. The cubic root of 145456331 is about 525.9093308035.

The spelling of 145456331 in words is "one hundred forty-five million, four hundred fifty-six thousand, three hundred thirty-one".