1982169545 has 4 divisors (see below), whose sum is σ = 2378603460. Its totient is φ = 1585735632.

The previous prime is 1982169533. The next prime is 1982169557. The reversal of 1982169545 is 5459612891.

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

It is an interprime number because it is at equal distance from previous prime (1982169533) and next prime (1982169557).

It can be written as a sum of positive squares in 2 ways, for example, as 1279707529 + 702462016 = 35773^2 + 26504^2 .

It is a cyclic number.

It is not a de Polignac number, because 1982169545 - 2²⁴ = 1965392329 is a prime.

It is a super-2 number, since 2×1982169545² = 7857992210251014050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1982169493 and 1982169502.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198216950 + ... + 198216959.

It is an arithmetic number, because the mean of its divisors is an integer number (594650865).

Almost surely, 2^1982169545 is an apocalyptic number.

It is an amenable number.

1982169545 is a deficient number, since it is larger than the sum of its proper divisors (396433915).

1982169545 is an equidigital number, since it uses as much as digits as its factorization.

1982169545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396433914.

The product of its digits is 777600, while the sum is 50.

The square root of 1982169545 is about 44521.5626971920. The cubic root of 1982169545 is about 1256.1657068430.

The spelling of 1982169545 in words is "one billion, nine hundred eighty-two million, one hundred sixty-nine thousand, five hundred forty-five".