261931481194 has 4 divisors (see below), whose sum is σ = 392897221794. Its totient is φ = 130965740596.

The previous prime is 261931481173. The next prime is 261931481197. The reversal of 261931481194 is 491184139162.

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

It can be written as a sum of positive squares in only one way, i.e., 210072805569 + 51858675625 = 458337^2 + 227725^2 .

It is a super-3 number, since 3×261931481194³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (261931481197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65482870297 + ... + 65482870300.

Almost surely, 2^261931481194 is an apocalyptic number.

261931481194 is a deficient number, since it is larger than the sum of its proper divisors (130965740600).

261931481194 is a wasteful number, since it uses less digits than its factorization.

261931481194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130965740599.

The product of its digits is 373248, while the sum is 49.

The spelling of 261931481194 in words is "two hundred sixty-one billion, nine hundred thirty-one million, four hundred eighty-one thousand, one hundred ninety-four".