1201122857 has 4 divisors (see below), whose sum is σ = 1310315856. Its totient is φ = 1091929860.

The previous prime is 1201122851. The next prime is 1201122863. The reversal of 1201122857 is 7582211021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1201122851) and next prime (1201122863).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201122857 is a prime.

It is a super-2 number, since 2×1201122857² = 2885392235215684898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201122851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54596483 + ... + 54596504.

It is an arithmetic number, because the mean of its divisors is an integer number (327578964).

Almost surely, 2^1201122857 is an apocalyptic number.

It is an amenable number.

1201122857 is a deficient number, since it is larger than the sum of its proper divisors (109192999).

1201122857 is a wasteful number, since it uses less digits than its factorization.

1201122857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109192998.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 1201122857 is about 34657.2194066402. The cubic root of 1201122857 is about 1062.9899140819.

Adding to 1201122857 its reverse (7582211021), we get a palindrome (8783333878).

The spelling of 1201122857 in words is "one billion, two hundred one million, one hundred twenty-two thousand, eight hundred fifty-seven".