10291981 has 8 divisors (see below), whose sum is σ = 11955584. Its totient is φ = 8676720.

The previous prime is 10291973. The next prime is 10291993. The reversal of 10291981 is 18919201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10291981 - 2³ = 10291973 is a prime.

It is a super-2 number, since 2×10291981² = 211849745808722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10291951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11625 + ... + 12478.

It is an arithmetic number, because the mean of its divisors is an integer number (1494448).

Almost surely, 2^10291981 is an apocalyptic number.

It is an amenable number.

10291981 is a deficient number, since it is larger than the sum of its proper divisors (1663603).

10291981 is an equidigital number, since it uses as much as digits as its factorization.

10291981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24171.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 10291981 is about 3208.1117499239. Note that the first 3 decimals coincide. The cubic root of 10291981 is about 217.5202324069.

The spelling of 10291981 in words is "ten million, two hundred ninety-one thousand, nine hundred eighty-one".