19901018135 has 16 divisors (see below), whose sum is σ = 24631978176. Its totient is φ = 15424005888.

The previous prime is 19901018119. The next prime is 19901018153. The reversal of 19901018135 is 53181010991.

It is not a de Polignac number, because 19901018135 - 2⁴ = 19901018119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187739 + ... + 273948.

It is an arithmetic number, because the mean of its divisors is an integer number (1539498636).

Almost surely, 2^19901018135 is an apocalyptic number.

19901018135 is a deficient number, since it is larger than the sum of its proper divisors (4730960041).

19901018135 is a wasteful number, since it uses less digits than its factorization.

19901018135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461962.

The product of its (nonzero) digits is 9720, while the sum is 38.

The spelling of 19901018135 in words is "nineteen billion, nine hundred one million, eighteen thousand, one hundred thirty-five".