145810981 has 2 divisors, whose sum is σ = 145810982. Its totient is φ = 145810980.

The previous prime is 145810963. The next prime is 145810993. The reversal of 145810981 is 189018541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139004100 + 6806881 = 11790^2 + 2609^2 .

It is a cyclic number.

It is not a de Polignac number, because 145810981 - 2¹⁹ = 145286693 is a prime.

It is a super-2 number, since 2×145810981² = 42521684360364722, which contains 22 as substring.

It is a Chen prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 145810981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145810901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72905490 + 72905491.

It is an arithmetic number, because the mean of its divisors is an integer number (72905491).

Almost surely, 2^145810981 is an apocalyptic number.

It is an amenable number.

145810981 is a deficient number, since it is larger than the sum of its proper divisors (1).

145810981 is an equidigital number, since it uses as much as digits as its factorization.

145810981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 37.

The square root of 145810981 is about 12075.2217785016. The cubic root of 145810981 is about 526.3364059782.

The spelling of 145810981 in words is "one hundred forty-five million, eight hundred ten thousand, nine hundred eighty-one".