1631401 has 4 divisors (see below), whose sum is σ = 1642500. Its totient is φ = 1620304.

The previous prime is 1631369. The next prime is 1631407. The reversal of 1631401 is 1041361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 133225 + 1498176 = 365^2 + 1224^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631401 - 2⁵ = 1631369 is a prime.

It is a super-2 number, since 2×1631401² = 5322938445602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1631407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5326 + ... + 5623.

It is an arithmetic number, because the mean of its divisors is an integer number (410625).

2^1631401 is an apocalyptic number.

It is an amenable number.

1631401 is a deficient number, since it is larger than the sum of its proper divisors (11099).

1631401 is a wasteful number, since it uses less digits than its factorization.

1631401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11098.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1631401 is about 1277.2630895787. The cubic root of 1631401 is about 117.7209002759.

Adding to 1631401 its reverse (1041361), we get a palindrome (2672762).

The spelling of 1631401 in words is "one million, six hundred thirty-one thousand, four hundred one".