1498071991 has 4 divisors (see below), whose sum is σ = 1613308312. Its totient is φ = 1382835672.

The previous prime is 1498071989. The next prime is 1498072001. The reversal of 1498071991 is 1991708941.

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 1498071991 - 2¹ = 1498071989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1498071191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57618141 + ... + 57618166.

It is an arithmetic number, because the mean of its divisors is an integer number (403327078).

Almost surely, 2^1498071991 is an apocalyptic number.

1498071991 is a deficient number, since it is larger than the sum of its proper divisors (115236321).

1498071991 is a wasteful number, since it uses less digits than its factorization.

1498071991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115236320.

The product of its (nonzero) digits is 163296, while the sum is 49.

The square root of 1498071991 is about 38704.9349695875. The cubic root of 1498071991 is about 1144.2235835250.

The spelling of 1498071991 in words is "one billion, four hundred ninety-eight million, seventy-one thousand, nine hundred ninety-one".