145693081 has 4 divisors (see below), whose sum is σ = 146456064. Its totient is φ = 144930100.

The previous prime is 145693069. The next prime is 145693099. The reversal of 145693081 is 180396541.

145693081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 180396541 = 13 ⋅13876657.

It is a cyclic number.

It is not a de Polignac number, because 145693081 - 2¹¹ = 145691033 is a prime.

It is a super-2 number, since 2×145693081² = 42452947702545122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145693081.

It is not an unprimeable number, because it can be changed into a prime (145693001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381205 + ... + 381586.

It is an arithmetic number, because the mean of its divisors is an integer number (36614016).

Almost surely, 2^145693081 is an apocalyptic number.

It is an amenable number.

145693081 is a deficient number, since it is larger than the sum of its proper divisors (762983).

145693081 is an equidigital number, since it uses as much as digits as its factorization.

145693081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762982.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 145693081 is about 12070.3388933368. The cubic root of 145693081 is about 526.1945058395.

The spelling of 145693081 in words is "one hundred forty-five million, six hundred ninety-three thousand, eighty-one".