1868749261 has 2 divisors, whose sum is σ = 1868749262. Its totient is φ = 1868749260.

The previous prime is 1868749249. The next prime is 1868749271. The reversal of 1868749261 is 1629478681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1368556036 + 500193225 = 36994^2 + 22365^2 .

It is an emirp because it is prime and its reverse (1629478681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1868749261 - 2¹⁹ = 1868224973 is a prime.

It is a super-2 number, since 2×1868749261² = 6984447600976092242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1868749199 and 1868749208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1868749271) 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, 934374630 + 934374631.

It is an arithmetic number, because the mean of its divisors is an integer number (934374631).

Almost surely, 2^1868749261 is an apocalyptic number.

It is an amenable number.

1868749261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868749261 is an equidigital number, since it uses as much as digits as its factorization.

1868749261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 52.

The square root of 1868749261 is about 43229.0326169809. The cubic root of 1868749261 is about 1231.7342318038.

The spelling of 1868749261 in words is "one billion, eight hundred sixty-eight million, seven hundred forty-nine thousand, two hundred sixty-one".