7121819 has 2 divisors, whose sum is σ = 7121820. Its totient is φ = 7121818.

The previous prime is 7121809. The next prime is 7121833. The reversal of 7121819 is 9181217.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7121819 is a prime.

It is a super-2 number, since 2×7121819² = 101440611737522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 7121791 and 7121800.

It is not a weakly prime, because it can be changed into another prime (7121809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3560909 + 3560910.

It is an arithmetic number, because the mean of its divisors is an integer number (3560910).

Almost surely, 2^7121819 is an apocalyptic number.

7121819 is a deficient number, since it is larger than the sum of its proper divisors (1).

7121819 is an equidigital number, since it uses as much as digits as its factorization.

7121819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 29.

The square root of 7121819 is about 2668.6736405938. The cubic root of 7121819 is about 192.3964158518.

The spelling of 7121819 in words is "seven million, one hundred twenty-one thousand, eight hundred nineteen".