1631120401 has 2 divisors, whose sum is σ = 1631120402. Its totient is φ = 1631120400.

The previous prime is 1631120353. The next prime is 1631120423. The reversal of 1631120401 is 1040211361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1019844225 + 611276176 = 31935^2 + 24724^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631120401 - 2¹⁹ = 1630596113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1631120201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815560200 + 815560201.

It is an arithmetic number, because the mean of its divisors is an integer number (815560201).

Almost surely, 2^1631120401 is an apocalyptic number.

It is an amenable number.

1631120401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631120401 is an equidigital number, since it uses as much as digits as its factorization.

1631120401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1631120401 is about 40387.1316262990. The cubic root of 1631120401 is about 1177.1415060472.

Adding to 1631120401 its reverse (1040211361), we get a palindrome (2671331762).

The spelling of 1631120401 in words is "one billion, six hundred thirty-one million, one hundred twenty thousand, four hundred one".