145420511 has 4 divisors (see below), whose sum is σ = 145454232. Its totient is φ = 145386792.

The previous prime is 145420493. The next prime is 145420553. The reversal of 145420511 is 115024541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 115024541 = 23 ⋅5001067.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145420511 is a prime.

It is a super-2 number, since 2×145420511² = 42294250039002242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145420111) 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, 9245 + ... + 19398.

It is an arithmetic number, because the mean of its divisors is an integer number (36363558).

Almost surely, 2^145420511 is an apocalyptic number.

145420511 is a deficient number, since it is larger than the sum of its proper divisors (33721).

145420511 is an equidigital number, since it uses as much as digits as its factorization.

145420511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33720.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 145420511 is about 12059.0427066165. The cubic root of 145420511 is about 525.8661572071.

The spelling of 145420511 in words is "one hundred forty-five million, four hundred twenty thousand, five hundred eleven".