151781121 has 20 divisors (see below), whose sum is σ = 227092800. Its totient is φ = 101027736.

The previous prime is 151781087. The next prime is 151781131. The reversal of 151781121 is 121187151.

151781121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 151781121 - 2⁹ = 151780609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (151781131) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 73420 + ... + 75458.

It is an arithmetic number, because the mean of its divisors is an integer number (11354640).

Almost surely, 2^151781121 is an apocalyptic number.

It is an amenable number.

151781121 is a deficient number, since it is larger than the sum of its proper divisors (75311679).

151781121 is an equidigital number, since it uses as much as digits as its factorization.

151781121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2970 (or 2961 counting only the distinct ones).

The product of its digits is 560, while the sum is 27.

The square root of 151781121 is about 12319.9480924231. The cubic root of 151781121 is about 533.4240412992.

The spelling of 151781121 in words is "one hundred fifty-one million, seven hundred eighty-one thousand, one hundred twenty-one".