1948143649 has 2 divisors, whose sum is σ = 1948143650. Its totient is φ = 1948143648.

The previous prime is 1948143629. The next prime is 1948143667. The reversal of 1948143649 is 9463418491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1728896400 + 219247249 = 41580^2 + 14807^2 .

It is a cyclic number.

It is not a de Polignac number, because 1948143649 - 2⁷ = 1948143521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1948143629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974071824 + 974071825.

It is an arithmetic number, because the mean of its divisors is an integer number (974071825).

Almost surely, 2^1948143649 is an apocalyptic number.

It is an amenable number.

1948143649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1948143649 is an equidigital number, since it uses as much as digits as its factorization.

1948143649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 49.

The square root of 1948143649 is about 44137.7802908121. The cubic root of 1948143649 is about 1248.9364070594.

The spelling of 1948143649 in words is "one billion, nine hundred forty-eight million, one hundred forty-three thousand, six hundred forty-nine".