145221131 has 8 divisors (see below), whose sum is σ = 158942784. Its totient is φ = 131586120.

The previous prime is 145221127. The next prime is 145221151. The reversal of 145221131 is 131122541.

145221131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145221131 - 2² = 145221127 is a prime.

It is a super-2 number, since 2×145221131² = 42178353777838322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145221121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18125 + ... + 24878.

It is an arithmetic number, because the mean of its divisors is an integer number (19867848).

Almost surely, 2^145221131 is an apocalyptic number.

145221131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

145221131 is a deficient number, since it is larger than the sum of its proper divisors (13721653).

145221131 is a wasteful number, since it uses less digits than its factorization.

145221131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43321.

The product of its digits is 240, while the sum is 20.

The square root of 145221131 is about 12050.7730457428. The cubic root of 145221131 is about 525.6257162325.

Adding to 145221131 its reverse (131122541), we get a palindrome (276343672).

The spelling of 145221131 in words is "one hundred forty-five million, two hundred twenty-one thousand, one hundred thirty-one".