145736881 has 4 divisors (see below), whose sum is σ = 145779712. Its totient is φ = 145694052.

The previous prime is 145736873. The next prime is 145736887. The reversal of 145736881 is 188637541.

145736881 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: 188637541 = 157 ⋅1201513.

It is a cyclic number.

It is not a de Polignac number, because 145736881 - 2³ = 145736873 is a prime.

It is a super-2 number, since 2×145736881² = 42478476967216322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145736887) 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, 15825 + ... + 23278.

It is an arithmetic number, because the mean of its divisors is an integer number (36444928).

Almost surely, 2^145736881 is an apocalyptic number.

It is an amenable number.

145736881 is a deficient number, since it is larger than the sum of its proper divisors (42831).

145736881 is an equidigital number, since it uses as much as digits as its factorization.

145736881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42830.

The product of its digits is 161280, while the sum is 43.

The square root of 145736881 is about 12072.1531219580. The cubic root of 145736881 is about 526.2472308556.

The spelling of 145736881 in words is "one hundred forty-five million, seven hundred thirty-six thousand, eight hundred eighty-one".