919493420842 has 4 divisors (see below), whose sum is σ = 1379240131266. Its totient is φ = 459746710420.

The previous prime is 919493420803. The next prime is 919493420843. The reversal of 919493420842 is 248024394919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 248024394919 = 7 ⋅35432056417.

It can be written as a sum of positive squares in only one way, i.e., 862801334641 + 56692086201 = 928871^2 + 238101^2 .

It is not an unprimeable number, because it can be changed into a prime (919493420843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 229873355209 + ... + 229873355212.

Almost surely, 2^919493420842 is an apocalyptic number.

919493420842 is a deficient number, since it is larger than the sum of its proper divisors (459746710424).

919493420842 is a wasteful number, since it uses less digits than its factorization.

919493420842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459746710423.

The product of its (nonzero) digits is 4478976, while the sum is 55.

The spelling of 919493420842 in words is "nine hundred nineteen billion, four hundred ninety-three million, four hundred twenty thousand, eight hundred forty-two".