1401441491 has 2 divisors, whose sum is σ = 1401441492. Its totient is φ = 1401441490.

The previous prime is 1401441473. The next prime is 1401441527. The reversal of 1401441491 is 1941441041.

It is a weak prime.

It is an emirp because it is prime and its reverse (1941441041) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1401441491 is a prime.

It is not a weakly prime, because it can be changed into another prime (1401441421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700720745 + 700720746.

It is an arithmetic number, because the mean of its divisors is an integer number (700720746).

Almost surely, 2^1401441491 is an apocalyptic number.

1401441491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1401441491 is an equidigital number, since it uses as much as digits as its factorization.

1401441491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 1401441491 is about 37435.8316456306. The cubic root of 1401441491 is about 1119.0727580102.

The spelling of 1401441491 in words is "one billion, four hundred one million, four hundred forty-one thousand, four hundred ninety-one".