151545421 has 4 divisors (see below), whose sum is σ = 151665372. Its totient is φ = 151425472.

The previous prime is 151545403. The next prime is 151545431. The reversal of 151545421 is 124545151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124545151 = 2309 ⋅53939.

It can be written as a sum of positive squares in 2 ways, for example, as 127916100 + 23629321 = 11310^2 + 4861^2 .

It is a cyclic number.

It is not a de Polignac number, because 151545421 - 2¹⁷ = 151414349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 151545421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151545431) 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, 58060 + ... + 60613.

It is an arithmetic number, because the mean of its divisors is an integer number (37916343).

Almost surely, 2^151545421 is an apocalyptic number.

It is an amenable number.

151545421 is a deficient number, since it is larger than the sum of its proper divisors (119951).

151545421 is a wasteful number, since it uses less digits than its factorization.

151545421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119950.

The product of its digits is 4000, while the sum is 28.

The square root of 151545421 is about 12310.3785888168. The cubic root of 151545421 is about 533.1477812420.

The spelling of 151545421 in words is "one hundred fifty-one million, five hundred forty-five thousand, four hundred twenty-one".