145542469 has 4 divisors (see below), whose sum is σ = 145684396. Its totient is φ = 145400544.

The previous prime is 145542437. The next prime is 145542517. The reversal of 145542469 is 964245541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 964245541 = 7 ⋅137749363.

It can be written as a sum of positive squares in 2 ways, for example, as 139476100 + 6066369 = 11810^2 + 2463^2 .

It is a cyclic number.

It is not a de Polignac number, because 145542469 - 2⁵ = 145542437 is a prime.

It is a super-2 number, since 2×145542469² = 42365220565231922, 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 (145542269) 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, 69414 + ... + 71479.

It is an arithmetic number, because the mean of its divisors is an integer number (36421099).

Almost surely, 2^145542469 is an apocalyptic number.

It is an amenable number.

145542469 is a deficient number, since it is larger than the sum of its proper divisors (141927).

145542469 is a wasteful number, since it uses less digits than its factorization.

145542469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141926.

The product of its digits is 172800, while the sum is 40.

The square root of 145542469 is about 12064.0983500633. The cubic root of 145542469 is about 526.0131233262.

The spelling of 145542469 in words is "one hundred forty-five million, five hundred forty-two thousand, four hundred sixty-nine".