97901681 has 2 divisors, whose sum is σ = 97901682. Its totient is φ = 97901680.

The previous prime is 97901677. The next prime is 97901693. The reversal of 97901681 is 18610979.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60202081 + 37699600 = 7759^2 + 6140^2 .

It is a cyclic number.

It is not a de Polignac number, because 97901681 - 2² = 97901677 is a prime.

It is a super-2 number, since 2×97901681² = 19169478285251522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (97901641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48950840 + 48950841.

It is an arithmetic number, because the mean of its divisors is an integer number (48950841).

Almost surely, 2^97901681 is an apocalyptic number.

It is an amenable number.

97901681 is a deficient number, since it is larger than the sum of its proper divisors (1).

97901681 is an equidigital number, since it uses as much as digits as its factorization.

97901681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 97901681 is about 9894.5278310792. The cubic root of 97901681 is about 460.8893961582.

The spelling of 97901681 in words is "ninety-seven million, nine hundred one thousand, six hundred eighty-one".