145420451 has 4 divisors (see below), whose sum is σ = 158640504. Its totient is φ = 132200400.

The previous prime is 145420441. The next prime is 145420463. The reversal of 145420451 is 154024541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154024541 = 11 ⋅14002231.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145420451 is a prime.

It is a super-2 number, since 2×145420451² = 42294215138086802, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145420451.

It is not an unprimeable number, because it can be changed into a prime (145420441) 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, 6610010 + ... + 6610031.

It is an arithmetic number, because the mean of its divisors is an integer number (39660126).

Almost surely, 2^145420451 is an apocalyptic number.

145420451 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

145420451 is a deficient number, since it is larger than the sum of its proper divisors (13220053).

145420451 is a wasteful number, since it uses less digits than its factorization.

145420451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13220052.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 145420451 is about 12059.0402188566. The cubic root of 145420451 is about 525.8660848835.

Adding to 145420451 its reverse (154024541), we get a palindrome (299444992).

The spelling of 145420451 in words is "one hundred forty-five million, four hundred twenty thousand, four hundred fifty-one".