1918187357 has 2 divisors, whose sum is σ = 1918187358. Its totient is φ = 1918187356.

The previous prime is 1918187329. The next prime is 1918187393. The reversal of 1918187357 is 7537818191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1782021796 + 136165561 = 42214^2 + 11669^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918187357 - 2⁸ = 1918187101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918187057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959093678 + 959093679.

It is an arithmetic number, because the mean of its divisors is an integer number (959093679).

Almost surely, 2^1918187357 is an apocalyptic number.

It is an amenable number.

1918187357 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918187357 is an equidigital number, since it uses as much as digits as its factorization.

1918187357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 50.

The square root of 1918187357 is about 43797.1158525307. The cubic root of 1918187357 is about 1242.5017470594.

The spelling of 1918187357 in words is "one billion, nine hundred eighteen million, one hundred eighty-seven thousand, three hundred fifty-seven".