1981379282247 has 16 divisors (see below), whose sum is σ = 2948539847680. Its totient is φ = 1314996111576.

The previous prime is 1981379282221. The next prime is 1981379282273. The reversal of 1981379282247 is 7422829731891.

1981379282247 is a `hidden beast` number, since 1 + 9 + 81 + 37 + 9 + 282 + 247 = 666.

It is an interprime number because it is at equal distance from previous prime (1981379282221) and next prime (1981379282273).

It is not a de Polignac number, because 1981379282247 - 2³⁸ = 1706501375303 is a prime.

It is a super-3 number, since 3×1981379282247³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981379287247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164533033 + ... + 164545074.

It is an arithmetic number, because the mean of its divisors is an integer number (184283740480).

Almost surely, 2^{1981379282247} is an apocalyptic number.

1981379282247 is a deficient number, since it is larger than the sum of its proper divisors (967160565433).

1981379282247 is a wasteful number, since it uses less digits than its factorization.

1981379282247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329078339 (or 329078333 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 63.

The spelling of 1981379282247 in words is "one trillion, nine hundred eighty-one billion, three hundred seventy-nine million, two hundred eighty-two thousand, two hundred forty-seven".