906191667481 has 3 divisors (see below), whose sum is σ = 906192619423. Its totient is φ = 906190715540.

The previous prime is 906191667473. The next prime is 906191667487. The reversal of 906191667481 is 184766191609.

The square root of 906191667481 is 951941.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 243107177481 + 663084490000 = 493059^2 + 814300^2 .

It is not a de Polignac number, because 906191667481 - 2³ = 906191667473 is a prime.

It is a super-2 number, since 2×906191667481² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (906191667487) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 475971 + ... + 1427911.

Almost surely, 2^906191667481 is an apocalyptic number.

906191667481 is the 951941-st square number.

906191667481 is the 475971-st centered octagonal number.

It is an amenable number.

906191667481 is a deficient number, since it is larger than the sum of its proper divisors (951942).

906191667481 is an frugal number, since it uses more digits than its factorization.

906191667481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1903882 (or 951941 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 58.

The spelling of 906191667481 in words is "nine hundred six billion, one hundred ninety-one million, six hundred sixty-seven thousand, four hundred eighty-one".