191146463209 has 21 divisors (see below), whose sum is σ = 208121140443. Its totient is φ = 175556241432.

The previous prime is 191146463203. The next prime is 191146463213. The reversal of 191146463209 is 902364641191.

The square root of 191146463209 is 437203.

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

It can be written as a sum of positive squares in 3 ways, for example, as 163996651225 + 27149811984 = 404965^2 + 164772^2 .

It is not a de Polignac number, because 191146463209 - 2³ = 191146463201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191146463201) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 960534892 + ... + 960535090.

Almost surely, 2^191146463209 is an apocalyptic number.

191146463209 is the 437203-rd square number.

191146463209 is the 218602-nd centered octagonal number.

It is an amenable number.

191146463209 is a deficient number, since it is larger than the sum of its proper divisors (16974677234).

191146463209 is an frugal number, since it uses more digits than its factorization.

191146463209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 191146463209 in words is "one hundred ninety-one billion, one hundred forty-six million, four hundred sixty-three thousand, two hundred nine".