145621129 has 4 divisors (see below), whose sum is σ = 145953280. Its totient is φ = 145288980.

The previous prime is 145621123. The next prime is 145621139. The reversal of 145621129 is 921126541.

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: 921126541 = 41 ⋅22466501.

It is a cyclic number.

It is not a de Polignac number, because 145621129 - 2⁵ = 145621097 is a prime.

It is a super-2 number, since 2×145621129² = 42411026422469282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145621129.

It is not an unprimeable number, because it can be changed into a prime (145621123) 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, 165417 + ... + 166294.

It is an arithmetic number, because the mean of its divisors is an integer number (36488320).

Almost surely, 2^145621129 is an apocalyptic number.

It is an amenable number.

145621129 is a deficient number, since it is larger than the sum of its proper divisors (332151).

145621129 is an equidigital number, since it uses as much as digits as its factorization.

145621129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332150.

The product of its digits is 4320, while the sum is 31.

The square root of 145621129 is about 12067.3579958498. The cubic root of 145621129 is about 526.1078694182.

The spelling of 145621129 in words is "one hundred forty-five million, six hundred twenty-one thousand, one hundred twenty-nine".