19971051 has 4 divisors (see below), whose sum is σ = 26628072. Its totient is φ = 13314032.

The previous prime is 19971047. The next prime is 19971101. The reversal of 19971051 is 15017991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19971051 - 2² = 19971047 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19971031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3328506 + ... + 3328511.

It is an arithmetic number, because the mean of its divisors is an integer number (6657018).

Almost surely, 2^19971051 is an apocalyptic number.

19971051 is a deficient number, since it is larger than the sum of its proper divisors (6657021).

19971051 is an equidigital number, since it uses as much as digits as its factorization.

19971051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6657020.

The product of its (nonzero) digits is 2835, while the sum is 33.

The square root of 19971051 is about 4468.8981863542. The cubic root of 19971051 is about 271.3107322937.

The spelling of 19971051 in words is "nineteen million, nine hundred seventy-one thousand, fifty-one".