145574993 has 4 divisors (see below), whose sum is σ = 145621668. Its totient is φ = 145528320.

The previous prime is 145574951. The next prime is 145575011. The reversal of 145574993 is 399475541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 133240849 + 12334144 = 11543^2 + 3512^2 .

It is a cyclic number.

It is not a de Polignac number, because 145574993 - 2¹⁶ = 145509457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145534993) 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, 18296 + ... + 25017.

It is an arithmetic number, because the mean of its divisors is an integer number (36405417).

Almost surely, 2^145574993 is an apocalyptic number.

It is an amenable number.

145574993 is a deficient number, since it is larger than the sum of its proper divisors (46675).

145574993 is an equidigital number, since it uses as much as digits as its factorization.

145574993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46674.

The product of its digits is 680400, while the sum is 47.

The square root of 145574993 is about 12065.4462412295. The cubic root of 145574993 is about 526.0523026731.

The spelling of 145574993 in words is "one hundred forty-five million, five hundred seventy-four thousand, nine hundred ninety-three".