97720351 has 2 divisors, whose sum is σ = 97720352. Its totient is φ = 97720350.

The previous prime is 97720333. The next prime is 97720391. The reversal of 97720351 is 15302779.

It is a weak prime.

It is an emirp because it is prime and its reverse (15302779) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97720351 - 2¹¹ = 97718303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97720331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48860175 + 48860176.

It is an arithmetic number, because the mean of its divisors is an integer number (48860176).

Almost surely, 2^97720351 is an apocalyptic number.

97720351 is a deficient number, since it is larger than the sum of its proper divisors (1).

97720351 is an equidigital number, since it uses as much as digits as its factorization.

97720351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 97720351 is about 9885.3604385475. The cubic root of 97720351 is about 460.6046726699.

The spelling of 97720351 in words is "ninety-seven million, seven hundred twenty thousand, three hundred fifty-one".