1391512049 has 2 divisors, whose sum is σ = 1391512050. Its totient is φ = 1391512048.

The previous prime is 1391512037. The next prime is 1391512093. The reversal of 1391512049 is 9402151931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1388903824 + 2608225 = 37268^2 + 1615^2 .

It is an emirp because it is prime and its reverse (9402151931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1391512049 is a prime.

It is not a weakly prime, because it can be changed into another prime (1391512019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695756024 + 695756025.

It is an arithmetic number, because the mean of its divisors is an integer number (695756025).

Almost surely, 2^1391512049 is an apocalyptic number.

It is an amenable number.

1391512049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391512049 is an equidigital number, since it uses as much as digits as its factorization.

1391512049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 1391512049 is about 37302.9764093966. The cubic root of 1391512049 is about 1116.4235536490.

The spelling of 1391512049 in words is "one billion, three hundred ninety-one million, five hundred twelve thousand, forty-nine".