145039867281 has 81 divisors (see below), whose sum is σ = 223050898161. Its totient is φ = 90816868224.

The previous prime is 145039867261. The next prime is 145039867309. The reversal of 145039867281 is 182768930541.

The square root of 145039867281 is 380841.

It is a perfect power (a square), and thus also a powerful number.

145039867281 is a `hidden beast` number, since 1 + 450 + 39 + 86 + 7 + 2 + 81 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 36179463681 + 108860403600 = 190209^2 + 329940^2 .

It is not a de Polignac number, because 145039867281 - 2⁷ = 145039867153 is a prime.

It is a super-2 number, since 2×145039867281² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145039867261) 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 in 80 ways as a sum of consecutive naturals, for example, 1986847461 + ... + 1986847533.

It is a 1-persistent number, because it is pandigital, but 2⋅145039867281 = 290079734562 is not.

Almost surely, 2^145039867281 is an apocalyptic number.

145039867281 is the 380841-st square number.

145039867281 is the 190421-st centered octagonal number.

It is an amenable number.

145039867281 is a deficient number, since it is larger than the sum of its proper divisors (78011030880).

145039867281 is an frugal number, since it uses more digits than its factorization.

145039867281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 145039867281 in words is "one hundred forty-five billion, thirty-nine million, eight hundred sixty-seven thousand, two hundred eighty-one".