1911948197 has 12 divisors (see below), whose sum is σ = 2039434956. Its totient is φ = 1786227840.

The previous prime is 1911948187. The next prime is 1911948223. The reversal of 1911948197 is 7918491191.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1580380516 + 331567681 = 39754^2 + 18209^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1911948197 is a prime.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1911948127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 325547 + ... + 331367.

It is an arithmetic number, because the mean of its divisors is an integer number (169952913).

Almost surely, 2^1911948197 is an apocalyptic number.

1911948197 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1911948197 is a deficient number, since it is larger than the sum of its proper divisors (127486759).

1911948197 is an equidigital number, since it uses as much as digits as its factorization.

1911948197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6116 (or 5977 counting only the distinct ones).

The product of its digits is 163296, while the sum is 50.

The square root of 1911948197 is about 43725.8298606213. The cubic root of 1911948197 is about 1241.1531496664.

The spelling of 1911948197 in words is "one billion, nine hundred eleven million, nine hundred forty-eight thousand, one hundred ninety-seven".