1205678417 has 2 divisors, whose sum is σ = 1205678418. Its totient is φ = 1205678416.

The previous prime is 1205678413. The next prime is 1205678447. The reversal of 1205678417 is 7148765021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1148464321 + 57214096 = 33889^2 + 7564^2 .

It is an emirp because it is prime and its reverse (7148765021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1205678417 - 2² = 1205678413 is a prime.

It is not a weakly prime, because it can be changed into another prime (1205678413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602839208 + 602839209.

It is an arithmetic number, because the mean of its divisors is an integer number (602839209).

Almost surely, 2^1205678417 is an apocalyptic number.

It is an amenable number.

1205678417 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205678417 is an equidigital number, since it uses as much as digits as its factorization.

1205678417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94080, while the sum is 41.

The square root of 1205678417 is about 34722.8803096748. The cubic root of 1205678417 is about 1064.3321040229.

The spelling of 1205678417 in words is "one billion, two hundred five million, six hundred seventy-eight thousand, four hundred seventeen".