1019797197 has 4 divisors (see below), whose sum is σ = 1359729600. Its totient is φ = 679864796.

The previous prime is 1019797193. The next prime is 1019797231. The reversal of 1019797197 is 7917979101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1019797197 - 2² = 1019797193 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1019797193) 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, 169966197 + ... + 169966202.

It is an arithmetic number, because the mean of its divisors is an integer number (339932400).

Almost surely, 2^1019797197 is an apocalyptic number.

It is an amenable number.

1019797197 is a deficient number, since it is larger than the sum of its proper divisors (339932403).

1019797197 is an equidigital number, since it uses as much as digits as its factorization.

1019797197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339932402.

The product of its (nonzero) digits is 250047, while the sum is 51.

The square root of 1019797197 is about 31934.2636833856. The cubic root of 1019797197 is about 1006.5559907246. Note that the first 3 decimals are identical.

It can be divided in two parts, 1019 and 797197, that added together give a triangular number (798216 = T₁₂₆₃).

The spelling of 1019797197 in words is "one billion, nineteen million, seven hundred ninety-seven thousand, one hundred ninety-seven".