1131200251 has 2 divisors, whose sum is σ = 1131200252. Its totient is φ = 1131200250.

The previous prime is 1131200249. The next prime is 1131200293. The reversal of 1131200251 is 1520021311.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1131200251 - 2¹ = 1131200249 is a prime.

It is a super-2 number, since 2×1131200251² = 2559228015724926002, which contains 22 as substring.

Together with 1131200249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1131200351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565600125 + 565600126.

It is an arithmetic number, because the mean of its divisors is an integer number (565600126).

Almost surely, 2^1131200251 is an apocalyptic number.

1131200251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131200251 is an equidigital number, since it uses as much as digits as its factorization.

1131200251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1131200251 is about 33633.3205467435. The cubic root of 1131200251 is about 1041.9490849750.

Adding to 1131200251 its reverse (1520021311), we get a palindrome (2651221562).

The spelling of 1131200251 in words is "one billion, one hundred thirty-one million, two hundred thousand, two hundred fifty-one".