10151991 has 12 divisors (see below), whose sum is σ = 14941368. Its totient is φ = 6639984.

The previous prime is 10151987. The next prime is 10152011. The reversal of 10151991 is 19915101.

It is not a de Polignac number, because 10151991 - 2² = 10151987 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10151971) 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, 10165 + ... + 11118.

It is an arithmetic number, because the mean of its divisors is an integer number (1245114).

Almost surely, 2^10151991 is an apocalyptic number.

10151991 is a deficient number, since it is larger than the sum of its proper divisors (4789377).

10151991 is a wasteful number, since it uses less digits than its factorization.

10151991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21342 (or 21339 counting only the distinct ones).

The product of its (nonzero) digits is 405, while the sum is 27.

The square root of 10151991 is about 3186.2189190324. The cubic root of 10151991 is about 216.5295008220.

The spelling of 10151991 in words is "ten million, one hundred fifty-one thousand, nine hundred ninety-one".