151893781 has 8 divisors (see below), whose sum is σ = 164172344. Its totient is φ = 139700160.

The previous prime is 151893773. The next prime is 151893787. The reversal of 151893781 is 187398151.

151893781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 11115556 + 140778225 = 3334^2 + 11865^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 151893781 - 2³ = 151893773 is a prime.

It is a super-2 number, since 2×151893781² = 46143441412951922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151893787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17490 + ... + 24691.

It is an arithmetic number, because the mean of its divisors is an integer number (20521543).

Almost surely, 2^151893781 is an apocalyptic number.

It is an amenable number.

151893781 is a deficient number, since it is larger than the sum of its proper divisors (12278563).

151893781 is a wasteful number, since it uses less digits than its factorization.

151893781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42471.

The product of its digits is 60480, while the sum is 43.

The square root of 151893781 is about 12324.5195038184. The cubic root of 151893781 is about 533.5559871994. Note that the first 3 decimals are identical.

The spelling of 151893781 in words is "one hundred fifty-one million, eight hundred ninety-three thousand, seven hundred eighty-one".