19471961 has 6 divisors (see below), whose sum is σ = 20355930. Its totient is φ = 18624848.

The previous prime is 19471957. The next prime is 19471973. The reversal of 19471961 is 16917491.

It can be written as a sum of positive squares in only one way, i.e., 15649936 + 3822025 = 3956^2 + 1955^2 .

It is not a de Polignac number, because 19471961 - 2² = 19471957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19471931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17876 + ... + 18933.

It is an arithmetic number, because the mean of its divisors is an integer number (3392655).

Almost surely, 2^19471961 is an apocalyptic number.

It is an amenable number.

19471961 is a deficient number, since it is larger than the sum of its proper divisors (883969).

19471961 is an equidigital number, since it uses as much as digits as its factorization.

19471961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36855 (or 36832 counting only the distinct ones).

The product of its digits is 13608, while the sum is 38.

The square root of 19471961 is about 4412.7044995105. The cubic root of 19471961 is about 269.0315602611.

The spelling of 19471961 in words is "nineteen million, four hundred seventy-one thousand, nine hundred sixty-one".