2602171989 has 6 divisors (see below), whose sum is σ = 3758692886. Its totient is φ = 1734781320.

The previous prime is 2602171981. The next prime is 2602172009. The reversal of 2602171989 is 9891712062.

It can be written as a sum of positive squares in only one way, i.e., 2597635089 + 4536900 = 50967^2 + 2130^2 .

It is not a de Polignac number, because 2602171989 - 2³ = 2602171981 is a prime.

It is a super-2 number, since 2×2602171989² = 13542598120672432242, 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 (2602171981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 144565102 + ... + 144565119.

Almost surely, 2^2602171989 is an apocalyptic number.

It is an amenable number.

2602171989 is a deficient number, since it is larger than the sum of its proper divisors (1156520897).

2602171989 is a wasteful number, since it uses less digits than its factorization.

2602171989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289130227 (or 289130224 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 2602171989 is about 51011.4887941922. The cubic root of 2602171989 is about 1375.4516623537.

The spelling of 2602171989 in words is "two billion, six hundred two million, one hundred seventy-one thousand, nine hundred eighty-nine".