1868261069 has 2 divisors, whose sum is σ = 1868261070. Its totient is φ = 1868261068.

The previous prime is 1868261039. The next prime is 1868261093. The reversal of 1868261069 is 9601628681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1404375625 + 463885444 = 37475^2 + 21538^2 .

It is an emirp because it is prime and its reverse (9601628681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1868261069 - 2¹⁶ = 1868195533 is a prime.

It is a super-2 number, since 2×1868261069² = 6980798843882045522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1868261009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 934130534 + 934130535.

It is an arithmetic number, because the mean of its divisors is an integer number (934130535).

Almost surely, 2^1868261069 is an apocalyptic number.

It is an amenable number.

1868261069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868261069 is an equidigital number, since it uses as much as digits as its factorization.

1868261069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 1868261069 is about 43223.3856725731. The cubic root of 1868261069 is about 1231.6269630579.

The spelling of 1868261069 in words is "one billion, eight hundred sixty-eight million, two hundred sixty-one thousand, sixty-nine".