1911918473 has 2 divisors, whose sum is σ = 1911918474. Its totient is φ = 1911918472.

The previous prime is 1911918457. The next prime is 1911918487. The reversal of 1911918473 is 3748191191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1435500544 + 476417929 = 37888^2 + 21827^2 .

It is a cyclic number.

It is not a de Polignac number, because 1911918473 - 2⁴ = 1911918457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1911918373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 955959236 + 955959237.

It is an arithmetic number, because the mean of its divisors is an integer number (955959237).

Almost surely, 2^1911918473 is an apocalyptic number.

It is an amenable number.

1911918473 is a deficient number, since it is larger than the sum of its proper divisors (1).

1911918473 is an equidigital number, since it uses as much as digits as its factorization.

1911918473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 44.

The square root of 1911918473 is about 43725.4899686670. The cubic root of 1911918473 is about 1241.1467177928.

The spelling of 1911918473 in words is "one billion, nine hundred eleven million, nine hundred eighteen thousand, four hundred seventy-three".