1626431 has 2 divisors, whose sum is σ = 1626432. Its totient is φ = 1626430.

The previous prime is 1626379. The next prime is 1626433. The reversal of 1626431 is 1346261.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1626431 - 2¹⁸ = 1364287 is a prime.

It is a super-2 number, since 2×1626431² = 5290555595522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1626433, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1626397 and 1626406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1626433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 813215 + 813216.

It is an arithmetic number, because the mean of its divisors is an integer number (813216).

2^1626431 is an apocalyptic number.

1626431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1626431 is an equidigital number, since it uses as much as digits as its factorization.

1626431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 1626431 is about 1275.3160392624. The cubic root of 1626431 is about 117.6012346192.

The spelling of 1626431 in words is "one million, six hundred twenty-six thousand, four hundred thirty-one".