151999991 has 16 divisors (see below), whose sum is σ = 184736160. Its totient is φ = 123150720.

The previous prime is 151999987. The next prime is 152000047. The reversal of 151999991 is 199999151.

It is not a de Polignac number, because 151999991 - 2² = 151999987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151999931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14180 + ... + 22473.

It is an arithmetic number, because the mean of its divisors is an integer number (11546010).

Almost surely, 2^151999991 is an apocalyptic number.

151999991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

151999991 is a deficient number, since it is larger than the sum of its proper divisors (32736169).

151999991 is a wasteful number, since it uses less digits than its factorization.

151999991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36706.

The product of its digits is 295245, while the sum is 53.

The square root of 151999991 is about 12328.8276409397. The cubic root of 151999991 is about 533.6803192112.

The spelling of 151999991 in words is "one hundred fifty-one million, nine hundred ninety-nine thousand, nine hundred ninety-one".