1631421 has 20 divisors (see below), whose sum is σ = 2660064. Its totient is φ = 988200.

The previous prime is 1631407. The next prime is 1631447. The reversal of 1631421 is 1241361.

It is a happy number.

It is not a de Polignac number, because 1631421 - 2¹³ = 1623229 is a prime.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1631394 and 1631403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631471) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25 + ... + 1806.

2^1631421 is an apocalyptic number.

1631421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1631421 is a deficient number, since it is larger than the sum of its proper divisors (1028643).

1631421 is a wasteful number, since it uses less digits than its factorization.

1631421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854 (or 1845 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1631421 is about 1277.2709187952. The cubic root of 1631421 is about 117.7213813365.

Adding to 1631421 its reverse (1241361), we get a palindrome (2872782).

The spelling of 1631421 in words is "one million, six hundred thirty-one thousand, four hundred twenty-one".