19812533049 has 9 divisors (see below), whose sum is σ = 28618713253. Its totient is φ = 13208073852.

The previous prime is 19812532979. The next prime is 19812533053. The reversal of 19812533049 is 94033521891.

It is a happy number.

The square root of 19812533049 is 140757.

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

19812533049 is a `hidden beast` number, since 1 + 98 + 1 + 253 + 304 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 19812533049 - 2¹³ = 19812524857 is a prime.

It is a super-3 number, since 3×19812533049³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19812532995 and 19812533013.

It is not an unprimeable number, because it can be changed into a prime (19812533089) 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, 398812 + ... + 445730.

Almost surely, 2^19812533049 is an apocalyptic number.

19812533049 is the 140757-th square number.

19812533049 is the 70379-th centered octagonal number.

It is an amenable number.

19812533049 is a deficient number, since it is larger than the sum of its proper divisors (8806180204).

19812533049 is an frugal number, since it uses more digits than its factorization.

19812533049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93844 (or 46922 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 19812533049 in words is "nineteen billion, eight hundred twelve million, five hundred thirty-three thousand, forty-nine".