1491401 has 2 divisors, whose sum is σ = 1491402. Its totient is φ = 1491400.

The previous prime is 1491377. The next prime is 1491403. The reversal of 1491401 is 1041941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1000000 + 491401 = 1000^2 + 701^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491401 - 2¹⁴ = 1475017 is a prime.

Together with 1491403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1491403) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745700 + 745701.

It is an arithmetic number, because the mean of its divisors is an integer number (745701).

2^1491401 is an apocalyptic number.

It is an amenable number.

1491401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491401 is an equidigital number, since it uses as much as digits as its factorization.

1491401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1491401 is about 1221.2292986987. The cubic root of 1491401 is about 114.2522627543.

The spelling of 1491401 in words is "one million, four hundred ninety-one thousand, four hundred one".