1401223891 has 2 divisors, whose sum is σ = 1401223892. Its totient is φ = 1401223890.

The previous prime is 1401223877. The next prime is 1401223897. The reversal of 1401223891 is 1983221041.

1401223891 is nontrivially palindromic in base 7.

It is a strong prime.

It is an emirp because it is prime and its reverse (1983221041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1401223891 - 2⁷ = 1401223763 is a prime.

It is not a weakly prime, because it can be changed into another prime (1401223897) 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, 700611945 + 700611946.

It is an arithmetic number, because the mean of its divisors is an integer number (700611946).

Almost surely, 2^1401223891 is an apocalyptic number.

1401223891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1401223891 is an equidigital number, since it uses as much as digits as its factorization.

1401223891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1401223891 is about 37432.9252263298. The cubic root of 1401223891 is about 1119.0148360211.

The spelling of 1401223891 in words is "one billion, four hundred one million, two hundred twenty-three thousand, eight hundred ninety-one".