145492981 has 2 divisors, whose sum is σ = 145492982. Its totient is φ = 145492980.

The previous prime is 145492967. The next prime is 145492993. The reversal of 145492981 is 189294541.

145492981 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 can be written as a sum of positive squares in only one way, i.e., 144216081 + 1276900 = 12009^2 + 1130^2 .

It is a cyclic number.

It is not a de Polignac number, because 145492981 - 2⁹ = 145492469 is a prime.

It is a super-2 number, since 2×145492981² = 42336415040532722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145492901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72746490 + 72746491.

It is an arithmetic number, because the mean of its divisors is an integer number (72746491).

Almost surely, 2^145492981 is an apocalyptic number.

It is an amenable number.

145492981 is a deficient number, since it is larger than the sum of its proper divisors (1).

145492981 is an equidigital number, since it uses as much as digits as its factorization.

145492981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 43.

The square root of 145492981 is about 12062.0471313952. The cubic root of 145492981 is about 525.9534974576.

The spelling of 145492981 in words is "one hundred forty-five million, four hundred ninety-two thousand, nine hundred eighty-one".