151541721 has 6 divisors (see below), whose sum is σ = 218893610. Its totient is φ = 101027808.

The previous prime is 151541693. The next prime is 151541759. The reversal of 151541721 is 127145151.

151541721 is a `hidden beast` number, since 1 + 51 + 541 + 72 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 97298496 + 54243225 = 9864^2 + 7365^2 .

It is not a de Polignac number, because 151541721 - 2⁹ = 151541209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151541821) 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 5 ways as a sum of consecutive naturals, for example, 8418976 + ... + 8418993.

Almost surely, 2^151541721 is an apocalyptic number.

It is an amenable number.

151541721 is a deficient number, since it is larger than the sum of its proper divisors (67351889).

151541721 is a wasteful number, since it uses less digits than its factorization.

151541721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16837975 (or 16837972 counting only the distinct ones).

The product of its digits is 1400, while the sum is 27.

The square root of 151541721 is about 12310.2283081996. The cubic root of 151541721 is about 533.1434422505.

Adding to 151541721 its reverse (127145151), we get a palindrome (278686872).

The spelling of 151541721 in words is "one hundred fifty-one million, five hundred forty-one thousand, seven hundred twenty-one".