1251501881027 has 2 divisors, whose sum is σ = 1251501881028. Its totient is φ = 1251501881026.

The previous prime is 1251501881011. The next prime is 1251501881029. The reversal of 1251501881027 is 7201881051521.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1251501881027 - 2⁴ = 1251501881011 is a prime.

Together with 1251501881029, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1251501881029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625750940513 + 625750940514.

It is an arithmetic number, because the mean of its divisors is an integer number (625750940514).

Almost surely, 2^{1251501881027} is an apocalyptic number.

1251501881027 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251501881027 is an equidigital number, since it uses as much as digits as its factorization.

1251501881027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44800, while the sum is 41.

The spelling of 1251501881027 in words is "one trillion, two hundred fifty-one billion, five hundred one million, eight hundred eighty-one thousand, twenty-seven".