1121651 has 2 divisors, whose sum is σ = 1121652. Its totient is φ = 1121650.

The previous prime is 1121629. The next prime is 1121671. The reversal of 1121651 is 1561211.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1121651 - 2¹⁰ = 1120627 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121621) 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, 560825 + 560826.

It is an arithmetic number, because the mean of its divisors is an integer number (560826).

2^1121651 is an apocalyptic number.

1121651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121651 is an equidigital number, since it uses as much as digits as its factorization.

1121651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60, while the sum is 17.

The square root of 1121651 is about 1059.0802613589. The cubic root of 1121651 is about 103.9008856013.

Adding to 1121651 its reverse (1561211), we get a palindrome (2682862).

The spelling of 1121651 in words is "one million, one hundred twenty-one thousand, six hundred fifty-one".