1981182293 has 2 divisors, whose sum is σ = 1981182294. Its totient is φ = 1981182292.

The previous prime is 1981182283. The next prime is 1981182337. The reversal of 1981182293 is 3922811891.

It is a happy number.

It is an a-pointer prime, because the next prime (1981182337) can be obtained adding 1981182293 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1254718084 + 726464209 = 35422^2 + 26953^2 .

It is a cyclic number.

It is not a de Polignac number, because 1981182293 - 2¹⁴ = 1981165909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1981182263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990591146 + 990591147.

It is an arithmetic number, because the mean of its divisors is an integer number (990591147).

Almost surely, 2^1981182293 is an apocalyptic number.

It is an amenable number.

1981182293 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981182293 is an equidigital number, since it uses as much as digits as its factorization.

1981182293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 44.

The square root of 1981182293 is about 44510.4739696175. The cubic root of 1981182293 is about 1255.9571209093.

The spelling of 1981182293 in words is "one billion, nine hundred eighty-one million, one hundred eighty-two thousand, two hundred ninety-three".