97261921 has 2 divisors, whose sum is σ = 97261922. Its totient is φ = 97261920.

The previous prime is 97261919. The next prime is 97261949. The reversal of 97261921 is 12916279.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94303521 + 2958400 = 9711^2 + 1720^2 .

It is an emirp because it is prime and its reverse (12916279) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97261921 - 2¹ = 97261919 is a prime.

It is a super-2 number, since 2×97261921² = 18919762553220482, which contains 22 as substring.

Together with 97261919, it forms a pair of twin primes.

It is a nialpdrome in base 14.

It is not a weakly prime, because it can be changed into another prime (97261951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48630960 + 48630961.

It is an arithmetic number, because the mean of its divisors is an integer number (48630961).

Almost surely, 2^97261921 is an apocalyptic number.

It is an amenable number.

97261921 is a deficient number, since it is larger than the sum of its proper divisors (1).

97261921 is an equidigital number, since it uses as much as digits as its factorization.

97261921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 37.

The square root of 97261921 is about 9862.1458618295. The cubic root of 97261921 is about 459.8832737856.

The spelling of 97261921 in words is "ninety-seven million, two hundred sixty-one thousand, nine hundred twenty-one".