19897077249 has 45 divisors (see below), whose sum is σ = 34590944817. Its totient is φ = 11364680376.

The previous prime is 19897077217. The next prime is 19897077257. The reversal of 19897077249 is 94277079891.

The square root of 19897077249 is 141057.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 19897077249 - 2⁵ = 19897077217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (19897077259) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 8885472 + ... + 8887710.

Almost surely, 2^19897077249 is an apocalyptic number.

19897077249 is the 141057-th square number.

19897077249 is the 70529-th centered octagonal number.

It is an amenable number.

19897077249 is a deficient number, since it is larger than the sum of its proper divisors (14693867568).

19897077249 is an frugal number, since it uses more digits than its factorization.

19897077249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4504 (or 2249 counting only the distinct ones).

The product of its (nonzero) digits is 16003008, while the sum is 63.

The spelling of 19897077249 in words is "nineteen billion, eight hundred ninety-seven million, seventy-seven thousand, two hundred forty-nine".