1621031 has 2 divisors, whose sum is σ = 1621032. Its totient is φ = 1621030.

The previous prime is 1621019. The next prime is 1621033. The reversal of 1621031 is 1301261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1621031 - 2¹⁸ = 1358887 is a prime.

It is a super-2 number, since 2×1621031² = 5255483005922, which contains 22 as substring.

Together with 1621033, 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 = 1620997 and 1621015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810515 + 810516.

It is an arithmetic number, because the mean of its divisors is an integer number (810516).

2^1621031 is an apocalyptic number.

1621031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621031 is an equidigital number, since it uses as much as digits as its factorization.

1621031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1621031 is about 1273.1971567672. The cubic root of 1621031 is about 117.4709389424.

Adding to 1621031 its reverse (1301261), we get a palindrome (2922292).

The spelling of 1621031 in words is "one million, six hundred twenty-one thousand, thirty-one".