97721149 has 2 divisors, whose sum is σ = 97721150. Its totient is φ = 97721148.

The previous prime is 97721137. The next prime is 97721171. The reversal of 97721149 is 94112779.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93741124 + 3980025 = 9682^2 + 1995^2 .

It is a cyclic number.

It is not a de Polignac number, because 97721149 - 2¹¹ = 97719101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97721119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48860574 + 48860575.

It is an arithmetic number, because the mean of its divisors is an integer number (48860575).

Almost surely, 2^97721149 is an apocalyptic number.

It is an amenable number.

97721149 is a deficient number, since it is larger than the sum of its proper divisors (1).

97721149 is an equidigital number, since it uses as much as digits as its factorization.

97721149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 40.

The square root of 97721149 is about 9885.4008011815. The cubic root of 97721149 is about 460.6059264569.

The spelling of 97721149 in words is "ninety-seven million, seven hundred twenty-one thousand, one hundred forty-nine".