1948791797 has 2 divisors, whose sum is σ = 1948791798. Its totient is φ = 1948791796.

The previous prime is 1948791743. The next prime is 1948791799. The reversal of 1948791797 is 7971978491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1834066276 + 114725521 = 42826^2 + 10711^2 .

It is a cyclic number.

It is not a de Polignac number, because 1948791797 - 2¹⁶ = 1948726261 is a prime.

Together with 1948791799, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1948791799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974395898 + 974395899.

It is an arithmetic number, because the mean of its divisors is an integer number (974395899).

Almost surely, 2^1948791797 is an apocalyptic number.

It is an amenable number.

1948791797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1948791797 is an equidigital number, since it uses as much as digits as its factorization.

1948791797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8001504, while the sum is 62.

The square root of 1948791797 is about 44145.1220068537. The cubic root of 1948791797 is about 1249.0748988792.

The spelling of 1948791797 in words is "one billion, nine hundred forty-eight million, seven hundred ninety-one thousand, seven hundred ninety-seven".