1401171391 has 2 divisors, whose sum is σ = 1401171392. Its totient is φ = 1401171390.

The previous prime is 1401171377. The next prime is 1401171407. The reversal of 1401171391 is 1931711041.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1401171391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1401171301) 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 as a sum of consecutive naturals, namely, 700585695 + 700585696.

It is an arithmetic number, because the mean of its divisors is an integer number (700585696).

Almost surely, 2^1401171391 is an apocalyptic number.

1401171391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1401171391 is an equidigital number, since it uses as much as digits as its factorization.

1401171391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 28.

The square root of 1401171391 is about 37432.2239654552. The cubic root of 1401171391 is about 1119.0008603786. Note that the first 3 decimals are identical.

The spelling of 1401171391 in words is "one billion, four hundred one million, one hundred seventy-one thousand, three hundred ninety-one".