1811197146 has 64 divisors (see below), whose sum is σ = 4265809920. Its totient is φ = 506869440.

The previous prime is 1811197139. The next prime is 1811197147. The reversal of 1811197146 is 6417911181.

It is not an unprimeable number, because it can be changed into a prime (1811197147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23451 + ... + 64593.

It is an arithmetic number, because the mean of its divisors is an integer number (66653280).

Almost surely, 2^1811197146 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1811197146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2132904960).

1811197146 is an abundant number, since it is smaller than the sum of its proper divisors (2454612774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1811197146 is a wasteful number, since it uses less digits than its factorization.

1811197146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41211.

The product of its digits is 12096, while the sum is 39.

The square root of 1811197146 is about 42558.1619198950. The cubic root of 1811197146 is about 1218.9575315019.

The spelling of 1811197146 in words is "one billion, eight hundred eleven million, one hundred ninety-seven thousand, one hundred forty-six".