97721481 has 16 divisors (see below), whose sum is σ = 153074880. Its totient is φ = 54669120.

The previous prime is 97721471. The next prime is 97721509. The reversal of 97721481 is 18412779.

It is not a de Polignac number, because 97721481 - 2⁹ = 97720969 is a prime.

It is a super-2 number, since 2×97721481² = 19098975697666722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (97721431) 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 15 ways as a sum of consecutive naturals, for example, 113466 + ... + 114323.

It is an arithmetic number, because the mean of its divisors is an integer number (9567180).

Almost surely, 2^97721481 is an apocalyptic number.

It is an amenable number.

97721481 is a deficient number, since it is larger than the sum of its proper divisors (55353399).

97721481 is a wasteful number, since it uses less digits than its factorization.

97721481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227816.

The product of its digits is 28224, while the sum is 39.

The square root of 97721481 is about 9885.4175936073. The cubic root of 97721481 is about 460.6064480806.

The spelling of 97721481 in words is "ninety-seven million, seven hundred twenty-one thousand, four hundred eighty-one".