1948891097 has 4 divisors (see below), whose sum is σ = 1948980276. Its totient is φ = 1948801920.

The previous prime is 1948891093. The next prime is 1948891099. The reversal of 1948891097 is 7901988491.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 553943296 + 1394947801 = 23536^2 + 37349^2 .

It is a cyclic number.

It is not a de Polignac number, because 1948891097 - 2² = 1948891093 is a prime.

It is a super-3 number, since 3×1948891097³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1948891093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12893 + ... + 63749.

It is an arithmetic number, because the mean of its divisors is an integer number (487245069).

Almost surely, 2^1948891097 is an apocalyptic number.

It is an amenable number.

1948891097 is a deficient number, since it is larger than the sum of its proper divisors (89179).

1948891097 is an equidigital number, since it uses as much as digits as its factorization.

1948891097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89178.

The product of its (nonzero) digits is 1306368, while the sum is 56.

The square root of 1948891097 is about 44146.2466921028. The cubic root of 1948891097 is about 1249.0961139095.

The spelling of 1948891097 in words is "one billion, nine hundred forty-eight million, eight hundred ninety-one thousand, ninety-seven".