3138691 has 2 divisors, whose sum is σ = 3138692. Its totient is φ = 3138690.

The previous prime is 3138671. The next prime is 3138767. The reversal of 3138691 is 1968313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3138691 - 2⁷ = 3138563 is a prime.

3138691 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (3138601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1569345 + 1569346.

It is an arithmetic number, because the mean of its divisors is an integer number (1569346).

Almost surely, 2^3138691 is an apocalyptic number.

3138691 is a deficient number, since it is larger than the sum of its proper divisors (1).

3138691 is an equidigital number, since it uses as much as digits as its factorization.

3138691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 31.

The square root of 3138691 is about 1771.6351204466. The cubic root of 3138691 is about 146.4140837427.

The spelling of 3138691 in words is "three million, one hundred thirty-eight thousand, six hundred ninety-one".