1391243201 has 4 divisors (see below), whose sum is σ = 1425176004. Its totient is φ = 1357310400.

The previous prime is 1391243197. The next prime is 1391243209. The reversal of 1391243201 is 1023421931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1023421931 = 7 ⋅146203133.

It can be written as a sum of positive squares in 2 ways, for example, as 641304976 + 749938225 = 25324^2 + 27385^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391243201 - 2² = 1391243197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1391243209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16966340 + ... + 16966421.

It is an arithmetic number, because the mean of its divisors is an integer number (356294001).

Almost surely, 2^1391243201 is an apocalyptic number.

It is an amenable number.

1391243201 is a deficient number, since it is larger than the sum of its proper divisors (33932803).

1391243201 is an equidigital number, since it uses as much as digits as its factorization.

1391243201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33932802.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1391243201 is about 37299.3726622848. The cubic root of 1391243201 is about 1116.3516492359.

The spelling of 1391243201 in words is "one billion, three hundred ninety-one million, two hundred forty-three thousand, two hundred one".