4991401 has 2 divisors, whose sum is σ = 4991402. Its totient is φ = 4991400.

The previous prime is 4991383. The next prime is 4991407. The reversal of 4991401 is 1041994.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4928400 + 63001 = 2220^2 + 251^2 .

It is a cyclic number.

It is not a de Polignac number, because 4991401 - 2¹¹ = 4989353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4991401.

It is not a weakly prime, because it can be changed into another prime (4991407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2495700 + 2495701.

It is an arithmetic number, because the mean of its divisors is an integer number (2495701).

Almost surely, 2^4991401 is an apocalyptic number.

It is an amenable number.

4991401 is a deficient number, since it is larger than the sum of its proper divisors (1).

4991401 is an equidigital number, since it uses as much as digits as its factorization.

4991401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 4991401 is about 2234.1443552286. The cubic root of 4991401 is about 170.8995111971.

The spelling of 4991401 in words is "four million, nine hundred ninety-one thousand, four hundred one".