151491 has 4 divisors (see below), whose sum is σ = 201992. Its totient is φ = 100992.

The previous prime is 151483. The next prime is 151499. The reversal of 151491 is 194151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194151 = 3 ⋅64717.

It is an interprime number because it is at equal distance from previous prime (151483) and next prime (151499).

It is not a de Polignac number, because 151491 - 2³ = 151483 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151499) 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, 25246 + ... + 25251.

It is an arithmetic number, because the mean of its divisors is an integer number (50498).

2¹⁵¹⁴⁹¹ is an apocalyptic number.

151491 is a deficient number, since it is larger than the sum of its proper divisors (50501).

151491 is an equidigital number, since it uses as much as digits as its factorization.

151491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50500.

The product of its digits is 180, while the sum is 21.

The square root of 151491 is about 389.2184476615. The cubic root of 151491 is about 53.3083954593.

The spelling of 151491 in words is "one hundred fifty-one thousand, four hundred ninety-one".