1951481993 has 2 divisors, whose sum is σ = 1951481994. Its totient is φ = 1951481992.

The previous prime is 1951481957. The next prime is 1951482019. The reversal of 1951481993 is 3991841591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1915637824 + 35844169 = 43768^2 + 5987^2 .

It is a cyclic number.

It is not a de Polignac number, because 1951481993 - 2¹⁴ = 1951465609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1951481923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 975740996 + 975740997.

It is an arithmetic number, because the mean of its divisors is an integer number (975740997).

Almost surely, 2^1951481993 is an apocalyptic number.

It is an amenable number.

1951481993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1951481993 is an equidigital number, since it uses as much as digits as its factorization.

1951481993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 50.

The square root of 1951481993 is about 44175.5814110013. The cubic root of 1951481993 is about 1249.6493935093.

The spelling of 1951481993 in words is "one billion, nine hundred fifty-one million, four hundred eighty-one thousand, nine hundred ninety-three".