97778623 has 2 divisors, whose sum is σ = 97778624. Its totient is φ = 97778622.

The previous prime is 97778591. The next prime is 97778627. The reversal of 97778623 is 32687779.

It is a strong prime.

It is an emirp because it is prime and its reverse (32687779) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97778623 - 2⁵ = 97778591 is a prime.

It is a super-2 number, since 2×97778623² = 19121318231552258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97778627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48889311 + 48889312.

It is an arithmetic number, because the mean of its divisors is an integer number (48889312).

Almost surely, 2^97778623 is an apocalyptic number.

97778623 is a deficient number, since it is larger than the sum of its proper divisors (1).

97778623 is an equidigital number, since it uses as much as digits as its factorization.

97778623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 889056, while the sum is 49.

The square root of 97778623 is about 9888.3073880215. The cubic root of 97778623 is about 460.6962094613.

The spelling of 97778623 in words is "ninety-seven million, seven hundred seventy-eight thousand, six hundred twenty-three".