19286821129 has 9 divisors (see below), whose sum is σ = 19474857493. Its totient is φ = 19100587072.

The previous prime is 19286821121. The next prime is 19286821153. The reversal of 19286821129 is 92112868291.

The square root of 19286821129 is 138877.

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 6943225 + 19279877904 = 2635^2 + 138852^2 .

It is not a de Polignac number, because 19286821129 - 2³ = 19286821121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19286821121) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15692487 + ... + 15693715.

Almost surely, 2^19286821129 is an apocalyptic number.

19286821129 is the 138877-th square number.

19286821129 is the 69439-th centered octagonal number.

It is an amenable number.

19286821129 is a deficient number, since it is larger than the sum of its proper divisors (188036364).

19286821129 is an frugal number, since it uses more digits than its factorization.

19286821129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2684 (or 1342 counting only the distinct ones).

The product of its digits is 248832, while the sum is 49.

Multiplying 19286821129 by its sum of digits (49), we get a square (945054235321 = 972139²).

The spelling of 19286821129 in words is "nineteen billion, two hundred eighty-six million, eight hundred twenty-one thousand, one hundred twenty-nine".