906186981 has 12 divisors (see below), whose sum is σ = 1381066592. Its totient is φ = 517742304.

The previous prime is 906186977. The next prime is 906186997. The reversal of 906186981 is 189681609.

It is not a de Polignac number, because 906186981 - 2² = 906186977 is a prime.

It is a super-2 number, since 2×906186981² = 1642349689067788722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 906186981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (906186971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134665 + ... + 141233.

Almost surely, 2^906186981 is an apocalyptic number.

It is an amenable number.

906186981 is a deficient number, since it is larger than the sum of its proper divisors (474879611).

906186981 is an frugal number, since it uses more digits than its factorization.

906186981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13148 (or 6579 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 906186981 is about 30102.9397401649. The cubic root of 906186981 is about 967.6967284853.

The spelling of 906186981 in words is "nine hundred six million, one hundred eighty-six thousand, nine hundred eighty-one".