1201178857 has 2 divisors, whose sum is σ = 1201178858. Its totient is φ = 1201178856.

The previous prime is 1201178821. The next prime is 1201178861. The reversal of 1201178857 is 7588711021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 693848281 + 507330576 = 26341^2 + 22524^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201178857 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201178357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600589428 + 600589429.

It is an arithmetic number, because the mean of its divisors is an integer number (600589429).

Almost surely, 2^1201178857 is an apocalyptic number.

It is an amenable number.

1201178857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201178857 is an equidigital number, since it uses as much as digits as its factorization.

1201178857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31360, while the sum is 40.

The square root of 1201178857 is about 34658.0273097013. The cubic root of 1201178857 is about 1063.0064337659.

Adding to 1201178857 its reverse (7588711021), we get a palindrome (8789889878).

The spelling of 1201178857 in words is "one billion, two hundred one million, one hundred seventy-eight thousand, eight hundred fifty-seven".