145515547 has 4 divisors (see below), whose sum is σ = 153174280. Its totient is φ = 137856816.

The previous prime is 145515497. The next prime is 145515553. The reversal of 145515547 is 745515541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 745515541 = 401 ⋅1859141.

It is a cyclic number.

It is not a de Polignac number, because 145515547 - 2¹¹ = 145513499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145515577) 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, 3829338 + ... + 3829375.

It is an arithmetic number, because the mean of its divisors is an integer number (38293570).

Almost surely, 2^145515547 is an apocalyptic number.

145515547 is a deficient number, since it is larger than the sum of its proper divisors (7658733).

145515547 is an equidigital number, since it uses as much as digits as its factorization.

145515547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7658732.

The product of its digits is 70000, while the sum is 37.

The square root of 145515547 is about 12062.9825084844. The cubic root of 145515547 is about 525.9806878942.

The spelling of 145515547 in words is "one hundred forty-five million, five hundred fifteen thousand, five hundred forty-seven".