1948023661 has 2 divisors, whose sum is σ = 1948023662. Its totient is φ = 1948023660.

The previous prime is 1948023643. The next prime is 1948023673. The reversal of 1948023661 is 1663208491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1832353636 + 115670025 = 42806^2 + 10755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1948023661 - 2²¹ = 1945926509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1948023631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974011830 + 974011831.

It is an arithmetic number, because the mean of its divisors is an integer number (974011831).

Almost surely, 2^1948023661 is an apocalyptic number.

It is an amenable number.

1948023661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1948023661 is an equidigital number, since it uses as much as digits as its factorization.

1948023661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 1948023661 is about 44136.4210261775. The cubic root of 1948023661 is about 1248.9107654769.

The spelling of 1948023661 in words is "one billion, nine hundred forty-eight million, twenty-three thousand, six hundred sixty-one".