1951998087 has 8 divisors (see below), whose sum is σ = 2802869104. Its totient is φ = 1201229568.

The previous prime is 1951998019. The next prime is 1951998121. The reversal of 1951998087 is 7808991591.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1951998087 - 2¹⁰ = 1951997063 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 (1951998007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25025578 + ... + 25025655.

It is an arithmetic number, because the mean of its divisors is an integer number (350358638).

Almost surely, 2^1951998087 is an apocalyptic number.

1951998087 is a deficient number, since it is larger than the sum of its proper divisors (850871017).

1951998087 is a wasteful number, since it uses less digits than its factorization.

1951998087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50051249.

The product of its (nonzero) digits is 1632960, while the sum is 57.

The square root of 1951998087 is about 44181.4224193835. The cubic root of 1951998087 is about 1249.7595456417.

The spelling of 1951998087 in words is "one billion, nine hundred fifty-one million, nine hundred ninety-eight thousand, eighty-seven".