145219881 has 4 divisors (see below), whose sum is σ = 193626512. Its totient is φ = 96813252.

The previous prime is 145219873. The next prime is 145219889. The reversal of 145219881 is 188912541.

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: 188912541 = 3 ⋅62970847.

It is an interprime number because it is at equal distance from previous prime (145219873) and next prime (145219889).

It is not a de Polignac number, because 145219881 - 2³ = 145219873 is a prime.

It is a super-2 number, since 2×145219881² = 42177627675308322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145219889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24203311 + ... + 24203316.

It is an arithmetic number, because the mean of its divisors is an integer number (48406628).

Almost surely, 2^145219881 is an apocalyptic number.

It is an amenable number.

145219881 is a deficient number, since it is larger than the sum of its proper divisors (48406631).

145219881 is an equidigital number, since it uses as much as digits as its factorization.

145219881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48406630.

The product of its digits is 23040, while the sum is 39.

The square root of 145219881 is about 12050.7211817385. The cubic root of 145219881 is about 525.6242081094.

The spelling of 145219881 in words is "one hundred forty-five million, two hundred nineteen thousand, eight hundred eighty-one".