1918631903 has 2 divisors, whose sum is σ = 1918631904. Its totient is φ = 1918631902.

The previous prime is 1918631887. The next prime is 1918631927. The reversal of 1918631903 is 3091368191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1918631903 - 2⁴ = 1918631887 is a prime.

It is a super-2 number, since 2×1918631903² = 7362296758418802818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918631933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959315951 + 959315952.

It is an arithmetic number, because the mean of its divisors is an integer number (959315952).

Almost surely, 2^1918631903 is an apocalyptic number.

1918631903 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918631903 is an equidigital number, since it uses as much as digits as its factorization.

1918631903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 1918631903 is about 43802.1906187350. The cubic root of 1918631903 is about 1242.5977242182.

The spelling of 1918631903 in words is "one billion, nine hundred eighteen million, six hundred thirty-one thousand, nine hundred three".