145621345 has 4 divisors (see below), whose sum is σ = 174745620. Its totient is φ = 116497072.

The previous prime is 145621319. The next prime is 145621361. The reversal of 145621345 is 543126541.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 543126541 = 31 ⋅17520211.

It can be written as a sum of positive squares in 2 ways, for example, as 75463969 + 70157376 = 8687^2 + 8376^2 .

It is a cyclic number.

It is not a de Polignac number, because 145621345 - 2¹⁷ = 145490273 is a prime.

It is a super-2 number, since 2×145621345² = 42411152239218050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14562130 + ... + 14562139.

It is an arithmetic number, because the mean of its divisors is an integer number (43686405).

Almost surely, 2^145621345 is an apocalyptic number.

It is an amenable number.

145621345 is a deficient number, since it is larger than the sum of its proper divisors (29124275).

145621345 is an equidigital number, since it uses as much as digits as its factorization.

145621345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29124274.

The product of its digits is 14400, while the sum is 31.

The square root of 145621345 is about 12067.3669456100. The cubic root of 145621345 is about 526.1081295435.

Adding to 145621345 its reverse (543126541), we get a palindrome (688747886).

It can be divided in two parts, 1456 and 21345, that added together give a square (22801 = 151²).

The spelling of 145621345 in words is "one hundred forty-five million, six hundred twenty-one thousand, three hundred forty-five".