1055121491 has 2 divisors, whose sum is σ = 1055121492. Its totient is φ = 1055121490.

The previous prime is 1055121479. The next prime is 1055121533. The reversal of 1055121491 is 1941215501.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1055121491 - 2¹⁰ = 1055120467 is a prime.

It is a super-2 number, since 2×1055121491² = 2226562721540126162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1055121451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 527560745 + 527560746.

It is an arithmetic number, because the mean of its divisors is an integer number (527560746).

Almost surely, 2^1055121491 is an apocalyptic number.

1055121491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1055121491 is an equidigital number, since it uses as much as digits as its factorization.

1055121491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 1055121491 is about 32482.6336832468. The cubic root of 1055121491 is about 1018.0462057811.

Adding to 1055121491 its reverse (1941215501), we get a palindrome (2996336992).

The spelling of 1055121491 in words is "one billion, fifty-five million, one hundred twenty-one thousand, four hundred ninety-one".