1998049051 has 4 divisors (see below), whose sum is σ = 2044515352. Its totient is φ = 1951582752.

The previous prime is 1998049037. The next prime is 1998049069. The reversal of 1998049051 is 1509408991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1998049051 - 2¹³ = 1998040859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1998048992 and 1998049010.

It is not an unprimeable number, because it can be changed into a prime (1998049091) 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, 23233086 + ... + 23233171.

It is an arithmetic number, because the mean of its divisors is an integer number (511128838).

Almost surely, 2^1998049051 is an apocalyptic number.

1998049051 is a deficient number, since it is larger than the sum of its proper divisors (46466301).

1998049051 is an equidigital number, since it uses as much as digits as its factorization.

1998049051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46466300.

The product of its (nonzero) digits is 116640, while the sum is 46.

The square root of 1998049051 is about 44699.5419551476. The cubic root of 1998049051 is about 1259.5112429952.

The spelling of 1998049051 in words is "one billion, nine hundred ninety-eight million, forty-nine thousand, fifty-one".