19911082 has 4 divisors (see below), whose sum is σ = 29866626. Its totient is φ = 9955540.

The previous prime is 19911049. The next prime is 19911091. The reversal of 19911082 is 28011991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28011991 = 7 ⋅4001713.

It can be written as a sum of positive squares in only one way, i.e., 11553201 + 8357881 = 3399^2 + 2891^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4977769 + ... + 4977772.

Almost surely, 2^19911082 is an apocalyptic number.

19911082 is a deficient number, since it is larger than the sum of its proper divisors (9955544).

19911082 is an equidigital number, since it uses as much as digits as its factorization.

19911082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9955543.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 19911082 is about 4462.1835462025. The cubic root of 19911082 is about 271.0388963927.

The spelling of 19911082 in words is "nineteen million, nine hundred eleven thousand, eighty-two".