3691125781137 has 6 divisors (see below), whose sum is σ = 5331626128322. Its totient is φ = 2460750520752.

The previous prime is 3691125781129. The next prime is 3691125781159. The reversal of 3691125781137 is 7311875211963.

3691125781137 is a `hidden beast` number, since 3 + 69 + 1 + 1 + 2 + 578 + 1 + 1 + 3 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3335386300416 + 355739480721 = 1826304^2 + 596439^2 .

It is not a de Polignac number, because 3691125781137 - 2³ = 3691125781129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3691125781117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 205062543388 + ... + 205062543405.

Almost surely, 2^{3691125781137} is an apocalyptic number.

It is an amenable number.

3691125781137 is a deficient number, since it is larger than the sum of its proper divisors (1640500347185).

3691125781137 is a wasteful number, since it uses less digits than its factorization.

3691125781137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410125086799 (or 410125086796 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The spelling of 3691125781137 in words is "three trillion, six hundred ninety-one billion, one hundred twenty-five million, seven hundred eighty-one thousand, one hundred thirty-seven".