145317681 has 24 divisors (see below), whose sum is σ = 222599520. Its totient is φ = 91094976.

The previous prime is 145317671. The next prime is 145317713. The reversal of 145317681 is 186713541.

145317681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 145317681 - 2¹⁰ = 145316657 is a prime.

It is a super-2 number, since 2×145317681² = 42234456822435522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145317631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20326 + ... + 26528.

It is an arithmetic number, because the mean of its divisors is an integer number (9274980).

Almost surely, 2^145317681 is an apocalyptic number.

It is an amenable number.

145317681 is a deficient number, since it is larger than the sum of its proper divisors (77281839).

145317681 is a wasteful number, since it uses less digits than its factorization.

145317681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6365 (or 6362 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 145317681 is about 12054.7783471949. The cubic root of 145317681 is about 525.7421775213.

The spelling of 145317681 in words is "one hundred forty-five million, three hundred seventeen thousand, six hundred eighty-one".