1200986257 has 4 divisors (see below), whose sum is σ = 1264196080. Its totient is φ = 1137776436.

The previous prime is 1200986249. The next prime is 1200986273. The reversal of 1200986257 is 7526890021.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7526890021 = 7 ⋅1075270003.

It is a cyclic number.

It is not a de Polignac number, because 1200986257 - 2³ = 1200986249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200986207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31604883 + ... + 31604920.

It is an arithmetic number, because the mean of its divisors is an integer number (316049020).

Almost surely, 2^1200986257 is an apocalyptic number.

It is an amenable number.

1200986257 is a deficient number, since it is larger than the sum of its proper divisors (63209823).

1200986257 is an equidigital number, since it uses as much as digits as its factorization.

1200986257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63209822.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 1200986257 is about 34655.2486212406. The cubic root of 1200986257 is about 1062.9496156988.

The spelling of 1200986257 in words is "one billion, two hundred million, nine hundred eighty-six thousand, two hundred fifty-seven".