3781085137 has 4 divisors (see below), whose sum is σ = 3852426420. Its totient is φ = 3709743856.

The previous prime is 3781085131. The next prime is 3781085171. The reversal of 3781085137 is 7315801873.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3025440016 + 755645121 = 55004^2 + 27489^2 .

It is a cyclic number.

It is not a de Polignac number, because 3781085137 - 2²⁷ = 3646867409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3781085093 and 3781085102.

It is not an unprimeable number, because it can be changed into a prime (3781085131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35670562 + ... + 35670667.

It is an arithmetic number, because the mean of its divisors is an integer number (963106605).

Almost surely, 2^3781085137 is an apocalyptic number.

It is an amenable number.

3781085137 is a deficient number, since it is larger than the sum of its proper divisors (71341283).

3781085137 is an equidigital number, since it uses as much as digits as its factorization.

3781085137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71341282.

The product of its (nonzero) digits is 141120, while the sum is 43.

The square root of 3781085137 is about 61490.5288398140. The cubic root of 3781085137 is about 1557.8972789252.

The spelling of 3781085137 in words is "three billion, seven hundred eighty-one million, eighty-five thousand, one hundred thirty-seven".