19799261 has 2 divisors, whose sum is σ = 19799262. Its totient is φ = 19799260.

The previous prime is 19799249. The next prime is 19799293. The reversal of 19799261 is 16299791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13579225 + 6220036 = 3685^2 + 2494^2 .

It is a cyclic number.

It is not a de Polignac number, because 19799261 - 2¹⁰ = 19798237 is a prime.

It is a super-2 number, since 2×19799261² = 784021472292242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19799231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9899630 + 9899631.

It is an arithmetic number, because the mean of its divisors is an integer number (9899631).

Almost surely, 2^19799261 is an apocalyptic number.

It is an amenable number.

19799261 is a deficient number, since it is larger than the sum of its proper divisors (1).

19799261 is an equidigital number, since it uses as much as digits as its factorization.

19799261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 44.

The square root of 19799261 is about 4449.6360525328. The cubic root of 19799261 is about 270.5305571242.

The spelling of 19799261 in words is "nineteen million, seven hundred ninety-nine thousand, two hundred sixty-one".