151365881 has 4 divisors (see below), whose sum is σ = 152926452. Its totient is φ = 149805312.

The previous prime is 151365869. The next prime is 151365899. The reversal of 151365881 is 188563151.

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: 188563151 = 7 ⋅26937593.

It can be written as a sum of positive squares in 2 ways, for example, as 76387600 + 74978281 = 8740^2 + 8659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-151365881 is a prime.

It is a super-2 number, since 2×151365881² = 45823259861812322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (151365811) 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, 780140 + ... + 780333.

It is an arithmetic number, because the mean of its divisors is an integer number (38231613).

Almost surely, 2^151365881 is an apocalyptic number.

It is an amenable number.

151365881 is a deficient number, since it is larger than the sum of its proper divisors (1560571).

151365881 is an equidigital number, since it uses as much as digits as its factorization.

151365881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560570.

The product of its digits is 28800, while the sum is 38.

The square root of 151365881 is about 12303.0842068158. The cubic root of 151365881 is about 532.9371531276.

The spelling of 151365881 in words is "one hundred fifty-one million, three hundred sixty-five thousand, eight hundred eighty-one".