1020251155487 has 2 divisors, whose sum is σ = 1020251155488. Its totient is φ = 1020251155486.

The previous prime is 1020251155423. The next prime is 1020251155513. The reversal of 1020251155487 is 7845511520201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1020251155487 - 2⁶ = 1020251155423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020251155687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510125577743 + 510125577744.

It is an arithmetic number, because the mean of its divisors is an integer number (510125577744).

Almost surely, 2^{1020251155487} is an apocalyptic number.

1020251155487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020251155487 is an equidigital number, since it uses as much as digits as its factorization.

1020251155487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112000, while the sum is 41.

Adding to 1020251155487 its reverse (7845511520201), we get a palindrome (8865762675688).

The spelling of 1020251155487 in words is "one trillion, twenty billion, two hundred fifty-one million, one hundred fifty-five thousand, four hundred eighty-seven".