1391667149 has 2 divisors, whose sum is σ = 1391667150. Its totient is φ = 1391667148.

The previous prime is 1391667139. The next prime is 1391667197. The reversal of 1391667149 is 9417661931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 969076900 + 422590249 = 31130^2 + 20557^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391667149 - 2²⁰ = 1390618573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1391667119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695833574 + 695833575.

It is an arithmetic number, because the mean of its divisors is an integer number (695833575).

Almost surely, 2^1391667149 is an apocalyptic number.

It is an amenable number.

1391667149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391667149 is an equidigital number, since it uses as much as digits as its factorization.

1391667149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 47.

The square root of 1391667149 is about 37305.0552740510. The cubic root of 1391667149 is about 1116.4650315172.

The spelling of 1391667149 in words is "one billion, three hundred ninety-one million, six hundred sixty-seven thousand, one hundred forty-nine".