978141991501 has 2 divisors, whose sum is σ = 978141991502. Its totient is φ = 978141991500.

The previous prime is 978141991427. The next prime is 978141991507. The reversal of 978141991501 is 105199141879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 800649144100 + 177492847401 = 894790^2 + 421299^2 .

It is a cyclic number.

It is not a de Polignac number, because 978141991501 - 2⁷ = 978141991373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978141991507) 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, 489070995750 + 489070995751.

It is an arithmetic number, because the mean of its divisors is an integer number (489070995751).

Almost surely, 2^978141991501 is an apocalyptic number.

It is an amenable number.

978141991501 is a deficient number, since it is larger than the sum of its proper divisors (1).

978141991501 is an equidigital number, since it uses as much as digits as its factorization.

978141991501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 55.

The spelling of 978141991501 in words is "nine hundred seventy-eight billion, one hundred forty-one million, nine hundred ninety-one thousand, five hundred one".