97742921 has 2 divisors, whose sum is σ = 97742922. Its totient is φ = 97742920.

The previous prime is 97742861. The next prime is 97742927. The reversal of 97742921 is 12924779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66259600 + 31483321 = 8140^2 + 5611^2 .

It is a cyclic number.

It is not a de Polignac number, because 97742921 - 2¹⁴ = 97726537 is a prime.

It is a super-2 number, since 2×97742921² = 19107357211224482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (97742927) 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 as a sum of consecutive naturals, namely, 48871460 + 48871461.

It is an arithmetic number, because the mean of its divisors is an integer number (48871461).

Almost surely, 2^97742921 is an apocalyptic number.

It is an amenable number.

97742921 is a deficient number, since it is larger than the sum of its proper divisors (1).

97742921 is an equidigital number, since it uses as much as digits as its factorization.

97742921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 41.

The square root of 97742921 is about 9886.5019597429. The cubic root of 97742921 is about 460.6401311563.

The spelling of 97742921 in words is "ninety-seven million, seven hundred forty-two thousand, nine hundred twenty-one".