145122881 has 4 divisors (see below), whose sum is σ = 145378500. Its totient is φ = 144867264.

The previous prime is 145122877. The next prime is 145122899. The reversal of 145122881 is 188221541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57138481 + 87984400 = 7559^2 + 9380^2 .

It is a cyclic number.

It is not a de Polignac number, because 145122881 - 2² = 145122877 is a prime.

It is a super-2 number, since 2×145122881² = 42121301179480322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145122841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126956 + ... + 128093.

It is an arithmetic number, because the mean of its divisors is an integer number (36344625).

Almost surely, 2^145122881 is an apocalyptic number.

It is an amenable number.

145122881 is a deficient number, since it is larger than the sum of its proper divisors (255619).

145122881 is an equidigital number, since it uses as much as digits as its factorization.

145122881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255618.

The product of its digits is 5120, while the sum is 32.

The square root of 145122881 is about 12046.6958540506. The cubic root of 145122881 is about 525.5071513537.

The spelling of 145122881 in words is "one hundred forty-five million, one hundred twenty-two thousand, eight hundred eighty-one".