1051555243 has 2 divisors, whose sum is σ = 1051555244. Its totient is φ = 1051555242.

The previous prime is 1051555231. The next prime is 1051555279. The reversal of 1051555243 is 3425551501.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1051555243 is a prime.

It is a super-2 number, since 2×1051555243² = 2211536858161578098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1051555223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525777621 + 525777622.

It is an arithmetic number, because the mean of its divisors is an integer number (525777622).

Almost surely, 2^1051555243 is an apocalyptic number.

1051555243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1051555243 is an equidigital number, since it uses as much as digits as its factorization.

1051555243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15000, while the sum is 31.

The square root of 1051555243 is about 32427.6925327720. The cubic root of 1051555243 is about 1016.8979325303.

The spelling of 1051555243 in words is "one billion, fifty-one million, five hundred fifty-five thousand, two hundred forty-three".