145405451 has 4 divisors (see below), whose sum is σ = 148499232. Its totient is φ = 142311672.

The previous prime is 145405367. The next prime is 145405457. The reversal of 145405451 is 154504541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154504541 = 643 ⋅240287.

It is a cyclic number.

It is not a de Polignac number, because 145405451 - 2¹⁴ = 145389067 is a prime.

It is a super-2 number, since 2×145405451² = 42285490361026802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145405457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1546820 + ... + 1546913.

It is an arithmetic number, because the mean of its divisors is an integer number (37124808).

Almost surely, 2^145405451 is an apocalyptic number.

145405451 is a deficient number, since it is larger than the sum of its proper divisors (3093781).

145405451 is an equidigital number, since it uses as much as digits as its factorization.

145405451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3093780.

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 145405451 is about 12058.4182627739. The cubic root of 145405451 is about 525.8480033770.

Adding to 145405451 its reverse (154504541), we get a palindrome (299909992).

It can be divided in two parts, 14540 and 5451, that added together give a palindrome (19991).

The spelling of 145405451 in words is "one hundred forty-five million, four hundred five thousand, four hundred fifty-one".