1989135070501 has 2 divisors, whose sum is σ = 1989135070502. Its totient is φ = 1989135070500.

The previous prime is 1989135070469. The next prime is 1989135070541. The reversal of 1989135070501 is 1050705319891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1954138389025 + 34996681476 = 1397905^2 + 187074^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989135070501 - 2⁵ = 1989135070469 is a prime.

It is a super-3 number, since 3×1989135070501³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989135070541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994567535250 + 994567535251.

It is an arithmetic number, because the mean of its divisors is an integer number (994567535251).

Almost surely, 2^{1989135070501} is an apocalyptic number.

It is an amenable number.

1989135070501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989135070501 is an equidigital number, since it uses as much as digits as its factorization.

1989135070501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 340200, while the sum is 49.

The spelling of 1989135070501 in words is "one trillion, nine hundred eighty-nine billion, one hundred thirty-five million, seventy thousand, five hundred one".