145986121 has 4 divisors (see below), whose sum is σ = 146024644. Its totient is φ = 145947600.

The previous prime is 145986109. The next prime is 145986149. The reversal of 145986121 is 121689541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121689541 = 151 ⋅805891.

It can be written as a sum of positive squares in 2 ways, for example, as 143736121 + 2250000 = 11989^2 + 1500^2 .

It is a cyclic number.

It is not a de Polignac number, because 145986121 - 2¹¹ = 145984073 is a prime.

It is a super-3 number, since 3×145986121³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145986151) 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, 12870 + ... + 21391.

It is an arithmetic number, because the mean of its divisors is an integer number (36506161).

Almost surely, 2^145986121 is an apocalyptic number.

It is an amenable number.

145986121 is a deficient number, since it is larger than the sum of its proper divisors (38523).

145986121 is an equidigital number, since it uses as much as digits as its factorization.

145986121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38522.

The product of its digits is 17280, while the sum is 37.

The square root of 145986121 is about 12082.4716428386. The cubic root of 145986121 is about 526.5470569501.

The spelling of 145986121 in words is "one hundred forty-five million, nine hundred eighty-six thousand, one hundred twenty-one".