145885881 has 4 divisors (see below), whose sum is σ = 194514512. Its totient is φ = 97257252.

The previous prime is 145885879. The next prime is 145885889. The reversal of 145885881 is 188588541.

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.

It is not a de Polignac number, because 145885881 - 2¹ = 145885879 is a prime.

It is a super-2 number, since 2×145885881² = 42565380550292322, 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 145885881.

It is not an unprimeable number, because it can be changed into a prime (145885889) 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, 24314311 + ... + 24314316.

It is an arithmetic number, because the mean of its divisors is an integer number (48628628).

Almost surely, 2^145885881 is an apocalyptic number.

It is an amenable number.

145885881 is a deficient number, since it is larger than the sum of its proper divisors (48628631).

145885881 is an equidigital number, since it uses as much as digits as its factorization.

145885881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48628630.

The product of its digits is 409600, while the sum is 48.

The square root of 145885881 is about 12078.3227726369. The cubic root of 145885881 is about 526.4265131573.

The spelling of 145885881 in words is "one hundred forty-five million, eight hundred eighty-five thousand, eight hundred eighty-one".