1948723291 has 2 divisors, whose sum is σ = 1948723292. Its totient is φ = 1948723290.

The previous prime is 1948723261. The next prime is 1948723303. The reversal of 1948723291 is 1923278491.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1948723291 - 2¹³ = 1948715099 is a prime.

It is not a weakly prime, because it can be changed into another prime (1948723261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974361645 + 974361646.

It is an arithmetic number, because the mean of its divisors is an integer number (974361646).

Almost surely, 2^1948723291 is an apocalyptic number.

1948723291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1948723291 is an equidigital number, since it uses as much as digits as its factorization.

1948723291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The square root of 1948723291 is about 44144.3460819163. The cubic root of 1948723291 is about 1249.0602624384.

It can be divided in two parts, 19487 and 23291, that added together give a triangular number (42778 = T₂₉₂).

The spelling of 1948723291 in words is "one billion, nine hundred forty-eight million, seven hundred twenty-three thousand, two hundred ninety-one".