97888981 has 2 divisors, whose sum is σ = 97888982. Its totient is φ = 97888980.

The previous prime is 97888961. The next prime is 97888993. The reversal of 97888981 is 18988879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94770225 + 3118756 = 9735^2 + 1766^2 .

It is a cyclic number.

It is not a de Polignac number, because 97888981 - 2¹³ = 97880789 is a prime.

It is a super-2 number, since 2×97888981² = 19164505202436722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97888961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48944490 + 48944491.

It is an arithmetic number, because the mean of its divisors is an integer number (48944491).

Almost surely, 2^97888981 is an apocalyptic number.

It is an amenable number.

97888981 is a deficient number, since it is larger than the sum of its proper divisors (1).

97888981 is an equidigital number, since it uses as much as digits as its factorization.

97888981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 58.

The square root of 97888981 is about 9893.8860413894. The cubic root of 97888981 is about 460.8694661346.

It can be divided in two parts, 9788 and 8981, that added together give a square (18769 = 137²).

The spelling of 97888981 in words is "ninety-seven million, eight hundred eighty-eight thousand, nine hundred eighty-one".