19691049 has 32 divisors (see below), whose sum is σ = 33454080. Its totient is φ = 10029312.

The previous prime is 19691017. The next prime is 19691051. The reversal of 19691049 is 94019691.

Added to its reverse (94019691) it gives a triangular number (113710740 = T₁₅₀₈₀).

19691049 = T₁₇₅ + T₁₇₆ + ... + T₄₉₇.

It is not a de Polignac number, because 19691049 - 2⁵ = 19691017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19690998 and 19691016.

It is not an unprimeable number, because it can be changed into a prime (19691149) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5332 + ... + 8234.

It is an arithmetic number, because the mean of its divisors is an integer number (1045440).

Almost surely, 2^19691049 is an apocalyptic number.

19691049 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19691049 is a deficient number, since it is larger than the sum of its proper divisors (13763031).

19691049 is a wasteful number, since it uses less digits than its factorization.

19691049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2949.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 19691049 is about 4437.4597462963. The cubic root of 19691049 is about 270.0367988253.

Adding to 19691049 its reverse (94019691), we get a triangular number (113710740 = T₁₅₀₈₀).

The spelling of 19691049 in words is "nineteen million, six hundred ninety-one thousand, forty-nine".