1778474897 has 2 divisors, whose sum is σ = 1778474898. Its totient is φ = 1778474896.

The previous prime is 1778474891. The next prime is 1778474903. The reversal of 1778474897 is 7984748771.

It is a balanced prime because it is at equal distance from previous prime (1778474891) and next prime (1778474903).

It can be written as a sum of positive squares in only one way, i.e., 1487567761 + 290907136 = 38569^2 + 17056^2 .

It is a cyclic number.

It is not a de Polignac number, because 1778474897 - 2⁸ = 1778474641 is a prime.

It is not a weakly prime, because it can be changed into another prime (1778474891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 889237448 + 889237449.

It is an arithmetic number, because the mean of its divisors is an integer number (889237449).

Almost surely, 2^1778474897 is an apocalyptic number.

It is an amenable number.

1778474897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1778474897 is an equidigital number, since it uses as much as digits as its factorization.

1778474897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22127616, while the sum is 62.

The square root of 1778474897 is about 42171.9681423573. The cubic root of 1778474897 is about 1211.5720515740.

The spelling of 1778474897 in words is "one billion, seven hundred seventy-eight million, four hundred seventy-four thousand, eight hundred ninety-seven".