145223641 has 4 divisors (see below), whose sum is σ = 145251792. Its totient is φ = 145195492.

The previous prime is 145223629. The next prime is 145223653. The reversal of 145223641 is 146322541.

145223641 = T₉₈₃₈ + T₉₈₃₉ + T₉₈₄₀.

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: 146322541 = 1489 ⋅98269.

It is an interprime number because it is at equal distance from previous prime (145223629) and next prime (145223653).

It is a cyclic number.

It is not a de Polignac number, because 145223641 - 2⁵ = 145223609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145223671) 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, 3871 + ... + 17476.

It is an arithmetic number, because the mean of its divisors is an integer number (36312948).

Almost surely, 2^145223641 is an apocalyptic number.

145223641 is the 9840-th centered triangular number.

It is an amenable number.

145223641 is a deficient number, since it is larger than the sum of its proper divisors (28151).

145223641 is an equidigital number, since it uses as much as digits as its factorization.

145223641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28150.

The product of its digits is 5760, while the sum is 28.

The square root of 145223641 is about 12050.8771879893. The cubic root of 145223641 is about 525.6287445176.

The spelling of 145223641 in words is "one hundred forty-five million, two hundred twenty-three thousand, six hundred forty-one".