13156781001 has 16 divisors (see below), whose sum is σ = 21590615424. Its totient is φ = 6939840384.

The previous prime is 13156780999. The next prime is 13156781009. The reversal of 13156781001 is 10018765131.

It is not a de Polignac number, because 13156781001 - 2¹ = 13156780999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13156781009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24096396 + ... + 24096941.

It is an arithmetic number, because the mean of its divisors is an integer number (1349413464).

Almost surely, 2^13156781001 is an apocalyptic number.

It is an amenable number.

13156781001 is a deficient number, since it is larger than the sum of its proper divisors (8433834423).

13156781001 is a wasteful number, since it uses less digits than its factorization.

13156781001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48193360.

The product of its (nonzero) digits is 5040, while the sum is 33.

The spelling of 13156781001 in words is "thirteen billion, one hundred fifty-six million, seven hundred eighty-one thousand, one".