145267981 has 2 divisors, whose sum is σ = 145267982. Its totient is φ = 145267980.

The previous prime is 145267949. The next prime is 145267999. The reversal of 145267981 is 189762541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82065481 + 63202500 = 9059^2 + 7950^2 .

It is an emirp because it is prime and its reverse (189762541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145267981 - 2⁵ = 145267949 is a prime.

It is a super-2 number, since 2×145267981² = 42205572607632722, which contains 22 as substring.

It is a zygodrome in base 9.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145267921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72633990 + 72633991.

It is an arithmetic number, because the mean of its divisors is an integer number (72633991).

Almost surely, 2^145267981 is an apocalyptic number.

It is an amenable number.

145267981 is a deficient number, since it is larger than the sum of its proper divisors (1).

145267981 is an equidigital number, since it uses as much as digits as its factorization.

145267981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The square root of 145267981 is about 12052.7167476880. The cubic root of 145267981 is about 525.6822344471.

The spelling of 145267981 in words is "one hundred forty-five million, two hundred sixty-seven thousand, nine hundred eighty-one".