151547721 has 16 divisors (see below), whose sum is σ = 217875840. Its totient is φ = 93144960.

The previous prime is 151547717. The next prime is 151547779. The reversal of 151547721 is 127745151.

It is not a de Polignac number, because 151547721 - 2² = 151547717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (151547321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38325 + ... + 42093.

It is an arithmetic number, because the mean of its divisors is an integer number (13617240).

Almost surely, 2^151547721 is an apocalyptic number.

It is an amenable number.

151547721 is a deficient number, since it is larger than the sum of its proper divisors (66328119).

151547721 is a wasteful number, since it uses less digits than its factorization.

151547721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4816.

The product of its digits is 9800, while the sum is 33.

The square root of 151547721 is about 12310.4720055731. The cubic root of 151547721 is about 533.1504784172.

The spelling of 151547721 in words is "one hundred fifty-one million, five hundred forty-seven thousand, seven hundred twenty-one".