1019143981 has 2 divisors, whose sum is σ = 1019143982. Its totient is φ = 1019143980.

The previous prime is 1019143921. The next prime is 1019143997. The reversal of 1019143981 is 1893419101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529230025 + 489913956 = 23005^2 + 22134^2 .

It is a cyclic number.

It is not a de Polignac number, because 1019143981 - 2¹¹ = 1019141933 is a prime.

It is a super-2 number, since 2×1019143981² = 2077308908017056722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1019143981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1019143921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509571990 + 509571991.

It is an arithmetic number, because the mean of its divisors is an integer number (509571991).

Almost surely, 2^1019143981 is an apocalyptic number.

It is an amenable number.

1019143981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1019143981 is an equidigital number, since it uses as much as digits as its factorization.

1019143981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 37.

The square root of 1019143981 is about 31924.0345351273. The cubic root of 1019143981 is about 1006.3410333083.

The spelling of 1019143981 in words is "one billion, nineteen million, one hundred forty-three thousand, nine hundred eighty-one".