19871191030 has 128 divisors (see below), whose sum is σ = 39519684864. Its totient is φ = 7165132800.

The previous prime is 19871191019. The next prime is 19871191031. The reversal of 19871191030 is 3019117891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19871191031) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 100868892 + ... + 100869088.

It is an arithmetic number, because the mean of its divisors is an integer number (308747538).

Almost surely, 2^19871191030 is an apocalyptic number.

19871191030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19871191030 is a deficient number, since it is larger than the sum of its proper divisors (19648493834).

19871191030 is a wasteful number, since it uses less digits than its factorization.

19871191030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490.

The product of its (nonzero) digits is 13608, while the sum is 40.

The spelling of 19871191030 in words is "nineteen billion, eight hundred seventy-one million, one hundred ninety-one thousand, thirty".