151171591 has 4 divisors (see below), whose sum is σ = 151607592. Its totient is φ = 150735592.

The previous prime is 151171589. The next prime is 151171597. The reversal of 151171591 is 195171151.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 151171591 - 2¹ = 151171589 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 (151171597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217480 + ... + 218173.

It is an arithmetic number, because the mean of its divisors is an integer number (37901898).

Almost surely, 2^151171591 is an apocalyptic number.

151171591 is a deficient number, since it is larger than the sum of its proper divisors (436001).

151171591 is an equidigital number, since it uses as much as digits as its factorization.

151171591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436000.

The product of its digits is 1575, while the sum is 31.

The square root of 151171591 is about 12295.1856838358. The cubic root of 151171591 is about 532.7090332615.

The spelling of 151171591 in words is "one hundred fifty-one million, one hundred seventy-one thousand, five hundred ninety-one".