2019539421025 has 81 divisors (see below), whose sum is σ = 3075911552889. Its totient is φ = 1311327480960.

The previous prime is 2019539421013. The next prime is 2019539421043. The reversal of 2019539421025 is 5201249359102.

The square root of 2019539421025 is 1421105.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 863544591441 + 1155994829584 = 929271^2 + 1075172^2 .

It is not a de Polignac number, because 2019539421025 - 2⁷ = 2019539420897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 945033757 + ... + 945035893.

Almost surely, 2^{2019539421025} is an apocalyptic number.

2019539421025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2019539421025 is the 1421105-th square number.

2019539421025 is the 710553-rd centered octagonal number.

It is an amenable number.

2019539421025 is a deficient number, since it is larger than the sum of its proper divisors (1056372131864).

2019539421025 is an frugal number, since it uses more digits than its factorization.

2019539421025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4336 (or 2168 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 2019539421025 in words is "two trillion, nineteen billion, five hundred thirty-nine million, four hundred twenty-one thousand, twenty-five".