151621879 has 4 divisors (see below), whose sum is σ = 151650576. Its totient is φ = 151593184.

The previous prime is 151621823. The next prime is 151621891. The reversal of 151621879 is 978126151.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 978126151 = 3373 ⋅289987.

It is a cyclic number.

It is not a de Polignac number, because 151621879 - 2¹⁹ = 151097591 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151621979) 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 3 ways as a sum of consecutive naturals, for example, 3874 + ... + 17839.

It is an arithmetic number, because the mean of its divisors is an integer number (37912644).

Almost surely, 2^151621879 is an apocalyptic number.

151621879 is a deficient number, since it is larger than the sum of its proper divisors (28697).

151621879 is an equidigital number, since it uses as much as digits as its factorization.

151621879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28696.

The product of its digits is 30240, while the sum is 40.

The square root of 151621879 is about 12313.4836256845. The cubic root of 151621879 is about 533.2374277637.

The spelling of 151621879 in words is "one hundred fifty-one million, six hundred twenty-one thousand, eight hundred seventy-nine".