1024651981 has 2 divisors, whose sum is σ = 1024651982. Its totient is φ = 1024651980.

The previous prime is 1024651973. The next prime is 1024652003. The reversal of 1024651981 is 1891564201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1024640100 + 11881 = 32010^2 + 109^2 .

It is an emirp because it is prime and its reverse (1891564201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1024651981 - 2³ = 1024651973 is a prime.

It is a super-2 number, since 2×1024651981² = 2099823364334448722, 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 1024651981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1024651921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512325990 + 512325991.

It is an arithmetic number, because the mean of its divisors is an integer number (512325991).

Almost surely, 2^1024651981 is an apocalyptic number.

It is an amenable number.

1024651981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1024651981 is an equidigital number, since it uses as much as digits as its factorization.

1024651981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 1024651981 is about 32010.1855820925. The cubic root of 1024651981 is about 1008.1507123924.

The spelling of 1024651981 in words is "one billion, twenty-four million, six hundred fifty-one thousand, nine hundred eighty-one".