151229491 has 4 divisors (see below), whose sum is σ = 172833712. Its totient is φ = 129625272.

The previous prime is 151229489. The next prime is 151229497. The reversal of 151229491 is 194922151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194922151 = 79 ⋅2467369.

It is not a de Polignac number, because 151229491 - 2¹ = 151229489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151229497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10802100 + ... + 10802113.

It is an arithmetic number, because the mean of its divisors is an integer number (43208428).

Almost surely, 2^151229491 is an apocalyptic number.

151229491 is a deficient number, since it is larger than the sum of its proper divisors (21604221).

151229491 is an equidigital number, since it uses as much as digits as its factorization.

151229491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21604220.

The product of its digits is 6480, while the sum is 34.

The square root of 151229491 is about 12297.5400385606. The cubic root of 151229491 is about 532.7770352713. Note that the first 3 decimals are identical.

The spelling of 151229491 in words is "one hundred fifty-one million, two hundred twenty-nine thousand, four hundred ninety-one".