1024139981 has 2 divisors, whose sum is σ = 1024139982. Its totient is φ = 1024139980.

The previous prime is 1024139951. The next prime is 1024140037. The reversal of 1024139981 is 1899314201.

1024139981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 859017481 + 165122500 = 29309^2 + 12850^2 .

It is a cyclic number.

It is not a de Polignac number, because 1024139981 - 2¹⁰ = 1024138957 is a prime.

It is a super-2 number, since 2×1024139981² = 2097725401365360722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1024139951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512069990 + 512069991.

It is an arithmetic number, because the mean of its divisors is an integer number (512069991).

Almost surely, 2^1024139981 is an apocalyptic number.

It is an amenable number.

1024139981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1024139981 is an equidigital number, since it uses as much as digits as its factorization.

1024139981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 1024139981 is about 32002.1871283823. The cubic root of 1024139981 is about 1007.9827662109.

The spelling of 1024139981 in words is "one billion, twenty-four million, one hundred thirty-nine thousand, nine hundred eighty-one".