1051555493 has 2 divisors, whose sum is σ = 1051555494. Its totient is φ = 1051555492.

The previous prime is 1051555489. The next prime is 1051555499. The reversal of 1051555493 is 3945551501.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1048658689 + 2896804 = 32383^2 + 1702^2 .

It is a cyclic number.

It is not a de Polignac number, because 1051555493 - 2² = 1051555489 is a prime.

It is a super-2 number, since 2×1051555493² = 2211537909716946098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1051555499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525777746 + 525777747.

It is an arithmetic number, because the mean of its divisors is an integer number (525777747).

Almost surely, 2^1051555493 is an apocalyptic number.

It is an amenable number.

1051555493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1051555493 is an equidigital number, since it uses as much as digits as its factorization.

1051555493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67500, while the sum is 38.

The square root of 1051555493 is about 32427.6963875018. The cubic root of 1051555493 is about 1016.8980131171.

The spelling of 1051555493 in words is "one billion, fifty-one million, five hundred fifty-five thousand, four hundred ninety-three".