1642473269 has 4 divisors (see below), whose sum is σ = 1644989196. Its totient is φ = 1639957344.

The previous prime is 1642473257. The next prime is 1642473281. The reversal of 1642473269 is 9623742461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9623742461 = 59 ⋅163114279.

It is an interprime number because it is at equal distance from previous prime (1642473257) and next prime (1642473281).

It can be written as a sum of positive squares in 2 ways, for example, as 322023025 + 1320450244 = 17945^2 + 36338^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642473269 - 2⁸ = 1642473013 is a prime.

It is a super-2 number, since 2×1642473269² = 5395436878759092722, 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 (1642473289) 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, 1256984 + ... + 1258289.

It is an arithmetic number, because the mean of its divisors is an integer number (411247299).

Almost surely, 2^1642473269 is an apocalyptic number.

It is an amenable number.

1642473269 is a deficient number, since it is larger than the sum of its proper divisors (2515927).

1642473269 is an equidigital number, since it uses as much as digits as its factorization.

1642473269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515926.

The product of its digits is 435456, while the sum is 44.

The square root of 1642473269 is about 40527.4384707447. The cubic root of 1642473269 is about 1179.8662275337.

The spelling of 1642473269 in words is "one billion, six hundred forty-two million, four hundred seventy-three thousand, two hundred sixty-nine".