1871872449 has 4 divisors (see below), whose sum is σ = 2495829936. Its totient is φ = 1247914964.

The previous prime is 1871872421. The next prime is 1871872463. The reversal of 1871872449 is 9442781781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9442781781 = 3 ⋅3147593927.

It is a cyclic number.

It is not a de Polignac number, because 1871872449 - 2¹⁵ = 1871839681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1871872489) 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, 311978739 + ... + 311978744.

It is an arithmetic number, because the mean of its divisors is an integer number (623957484).

Almost surely, 2^1871872449 is an apocalyptic number.

It is an amenable number.

1871872449 is a deficient number, since it is larger than the sum of its proper divisors (623957487).

1871872449 is an equidigital number, since it uses as much as digits as its factorization.

1871872449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623957486.

The product of its digits is 903168, while the sum is 51.

The square root of 1871872449 is about 43265.1412686934. The cubic root of 1871872449 is about 1232.4200374649.

The spelling of 1871872449 in words is "one billion, eight hundred seventy-one million, eight hundred seventy-two thousand, four hundred forty-nine".