97721151 has 32 divisors (see below), whose sum is σ = 151227648. Its totient is φ = 55472640.

The previous prime is 97721149. The next prime is 97721171. The reversal of 97721151 is 15112779.

It is not a de Polignac number, because 97721151 - 2¹ = 97721149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97721101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209020 + ... + 209486.

It is an arithmetic number, because the mean of its divisors is an integer number (4725864).

Almost surely, 2^97721151 is an apocalyptic number.

97721151 is a deficient number, since it is larger than the sum of its proper divisors (53506497).

97721151 is a wasteful number, since it uses less digits than its factorization.

97721151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871.

The product of its digits is 4410, while the sum is 33.

The square root of 97721151 is about 9885.4009023408. The cubic root of 97721151 is about 460.6059295992.

The spelling of 97721151 in words is "ninety-seven million, seven hundred twenty-one thousand, one hundred fifty-one".