1618694947 has 2 divisors, whose sum is σ = 1618694948. Its totient is φ = 1618694946.

The previous prime is 1618694941. The next prime is 1618694999. The reversal of 1618694947 is 7494968161.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1618694947 is a prime.

It is not a weakly prime, because it can be changed into another prime (1618694941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 809347473 + 809347474.

It is an arithmetic number, because the mean of its divisors is an integer number (809347474).

Almost surely, 2^1618694947 is an apocalyptic number.

1618694947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1618694947 is an equidigital number, since it uses as much as digits as its factorization.

1618694947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 55.

The square root of 1618694947 is about 40233.0081773660. The cubic root of 1618694947 is about 1174.1448304790.

The spelling of 1618694947 in words is "one billion, six hundred eighteen million, six hundred ninety-four thousand, nine hundred forty-seven".