151671991 has 8 divisors (see below), whose sum is σ = 156028304. Its totient is φ = 147329280.

The previous prime is 151671983. The next prime is 151672007. The reversal of 151671991 is 199176151.

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 151671991 - 2³ = 151671983 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 (151671941) 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 7 ways as a sum of consecutive naturals, for example, 21856 + ... + 27946.

It is an arithmetic number, because the mean of its divisors is an integer number (19503538).

Almost surely, 2^151671991 is an apocalyptic number.

151671991 is a deficient number, since it is larger than the sum of its proper divisors (4356313).

151671991 is an equidigital number, since it uses as much as digits as its factorization.

151671991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6801.

The product of its digits is 17010, while the sum is 40.

The square root of 151671991 is about 12315.5183000960. The cubic root of 151671991 is about 533.2961674188.

The spelling of 151671991 in words is "one hundred fifty-one million, six hundred seventy-one thousand, nine hundred ninety-one".