145199669 has 6 divisors (see below), whose sum is σ = 154243554. Its totient is φ = 136658240.

The previous prime is 145199657. The next prime is 145199671. The reversal of 145199669 is 966991541.

It can be written as a sum of positive squares in 3 ways, for example, as 39212644 + 105987025 = 6262^2 + 10295^2 .

It is not a de Polignac number, because 145199669 - 2¹⁶ = 145134133 is a prime.

It is a super-2 number, since 2×145199669² = 42165887755419122, 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 (145199269) 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 5 ways as a sum of consecutive naturals, for example, 250922 + ... + 251499.

It is an arithmetic number, because the mean of its divisors is an integer number (25707259).

Almost surely, 2^145199669 is an apocalyptic number.

It is an amenable number.

145199669 is a deficient number, since it is larger than the sum of its proper divisors (9043885).

145199669 is an equidigital number, since it uses as much as digits as its factorization.

145199669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502455 (or 502438 counting only the distinct ones).

The product of its digits is 524880, while the sum is 50.

The square root of 145199669 is about 12049.8825305478. The cubic root of 145199669 is about 525.5998211606.

The spelling of 145199669 in words is "one hundred forty-five million, one hundred ninety-nine thousand, six hundred sixty-nine".