1918401157 has 2 divisors, whose sum is σ = 1918401158. Its totient is φ = 1918401156.

The previous prime is 1918401103. The next prime is 1918401203. The reversal of 1918401157 is 7511048191.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1909165636 + 9235521 = 43694^2 + 3039^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918401157 - 2²³ = 1910012549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918401757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959200578 + 959200579.

It is an arithmetic number, because the mean of its divisors is an integer number (959200579).

Almost surely, 2^1918401157 is an apocalyptic number.

It is an amenable number.

1918401157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918401157 is an equidigital number, since it uses as much as digits as its factorization.

1918401157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 37.

The square root of 1918401157 is about 43799.5565845135. The cubic root of 1918401157 is about 1242.5479081749.

The spelling of 1918401157 in words is "one billion, nine hundred eighteen million, four hundred one thousand, one hundred fifty-seven".