1868261357 has 2 divisors, whose sum is σ = 1868261358. Its totient is φ = 1868261356.

The previous prime is 1868261341. The next prime is 1868261371. The reversal of 1868261357 is 7531628681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1807015081 + 61246276 = 42509^2 + 7826^2 .

It is a cyclic number.

It is not a de Polignac number, because 1868261357 - 2⁴ = 1868261341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1868281357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 934130678 + 934130679.

It is an arithmetic number, because the mean of its divisors is an integer number (934130679).

Almost surely, 2^1868261357 is an apocalyptic number.

It is an amenable number.

1868261357 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868261357 is an equidigital number, since it uses as much as digits as its factorization.

1868261357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 47.

The square root of 1868261357 is about 43223.3890041029. The cubic root of 1868261357 is about 1231.6270263447.

The spelling of 1868261357 in words is "one billion, eight hundred sixty-eight million, two hundred sixty-one thousand, three hundred fifty-seven".