145718981 has 2 divisors, whose sum is σ = 145718982. Its totient is φ = 145718980.

The previous prime is 145718971. The next prime is 145718983. The reversal of 145718981 is 189817541.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130896481 + 14822500 = 11441^2 + 3850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145718981 is a prime.

It is a super-2 number, since 2×145718981² = 42468042847356722, which contains 22 as substring.

Together with 145718983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145718983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72859490 + 72859491.

It is an arithmetic number, because the mean of its divisors is an integer number (72859491).

Almost surely, 2^145718981 is an apocalyptic number.

It is an amenable number.

145718981 is a deficient number, since it is larger than the sum of its proper divisors (1).

145718981 is an equidigital number, since it uses as much as digits as its factorization.

145718981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 44.

The square root of 145718981 is about 12071.4117235724. The cubic root of 145718981 is about 526.2256846941.

The spelling of 145718981 in words is "one hundred forty-five million, seven hundred eighteen thousand, nine hundred eighty-one".