145573397 has 4 divisors (see below), whose sum is σ = 154136556. Its totient is φ = 137010240.

The previous prime is 145573387. The next prime is 145573403. The reversal of 145573397 is 793375541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 793375541 = 7 ⋅113339363.

It can be written as a sum of positive squares in 2 ways, for example, as 50822641 + 94750756 = 7129^2 + 9734^2 .

It is a cyclic number.

It is not a de Polignac number, because 145573397 - 2⁴ = 145573381 is a prime.

It is a super-2 number, since 2×145573397² = 42383227828239218, 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 (145573327) 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, 4281554 + ... + 4281587.

It is an arithmetic number, because the mean of its divisors is an integer number (38534139).

Almost surely, 2^145573397 is an apocalyptic number.

145573397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

145573397 is a deficient number, since it is larger than the sum of its proper divisors (8563159).

145573397 is an equidigital number, since it uses as much as digits as its factorization.

145573397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8563158.

The product of its digits is 396900, while the sum is 44.

The square root of 145573397 is about 12065.3801017622. The cubic root of 145573397 is about 526.0503802217.

The spelling of 145573397 in words is "one hundred forty-five million, five hundred seventy-three thousand, three hundred ninety-seven".