145520197 has 8 divisors (see below), whose sum is σ = 148106840. Its totient is φ = 142940160.

The previous prime is 145520191. The next prime is 145520201. The reversal of 145520197 is 791025541.

It can be written as a sum of positive squares in 4 ways, for example, as 37380996 + 108139201 = 6114^2 + 10399^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145520197 - 2³ = 145520189 is a prime.

It is a super-2 number, since 2×145520197² = 42352255469837618, 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 (145520191) 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 7 ways as a sum of consecutive naturals, for example, 67813 + ... + 69925.

It is an arithmetic number, because the mean of its divisors is an integer number (18513355).

Almost surely, 2^145520197 is an apocalyptic number.

It is an amenable number.

145520197 is a deficient number, since it is larger than the sum of its proper divisors (2586643).

145520197 is a wasteful number, since it uses less digits than its factorization.

145520197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3303.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 145520197 is about 12063.1752453490. The cubic root of 145520197 is about 525.9862904666.

The spelling of 145520197 in words is "one hundred forty-five million, five hundred twenty thousand, one hundred ninety-seven".