145228981 has 4 divisors (see below), whose sum is σ = 145342252. Its totient is φ = 145115712.

The previous prime is 145228961. The next prime is 145229003. The reversal of 145228981 is 189822541.

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 115906756 + 29322225 = 10766^2 + 5415^2 .

It is a cyclic number.

It is not a de Polignac number, because 145228981 - 2¹¹ = 145226933 is a prime.

It is a super-2 number, since 2×145228981² = 42182913844596722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145228961) 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, 54690 + ... + 57283.

It is an arithmetic number, because the mean of its divisors is an integer number (36335563).

Almost surely, 2^145228981 is an apocalyptic number.

It is an amenable number.

145228981 is a deficient number, since it is larger than the sum of its proper divisors (113271).

145228981 is a wasteful number, since it uses less digits than its factorization.

145228981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113270.

The product of its digits is 46080, while the sum is 40.

The square root of 145228981 is about 12051.0987465874. The cubic root of 145228981 is about 525.6351870478.

The spelling of 145228981 in words is "one hundred forty-five million, two hundred twenty-eight thousand, nine hundred eighty-one".