1011231251 has 2 divisors, whose sum is σ = 1011231252. Its totient is φ = 1011231250.

The previous prime is 1011231239. The next prime is 1011231283. The reversal of 1011231251 is 1521321101.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011231251 is a prime.

It is not a weakly prime, because it can be changed into another prime (1017231251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505615625 + 505615626.

It is an arithmetic number, because the mean of its divisors is an integer number (505615626).

Almost surely, 2^1011231251 is an apocalyptic number.

1011231251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011231251 is an equidigital number, since it uses as much as digits as its factorization.

1011231251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 1011231251 is about 31799.8624368094. The cubic root of 1011231251 is about 1003.7298214693.

Adding to 1011231251 its reverse (1521321101), we get a palindrome (2532552352).

The spelling of 1011231251 in words is "one billion, eleven million, two hundred thirty-one thousand, two hundred fifty-one".