921090097 has 2 divisors, whose sum is σ = 921090098. Its totient is φ = 921090096.

The previous prime is 921090091. The next prime is 921090187. The reversal of 921090097 is 790090129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 682202161 + 238887936 = 26119^2 + 15456^2 .

It is a cyclic number.

It is not a de Polignac number, because 921090097 - 2¹⁵ = 921057329 is a prime.

It is not a weakly prime, because it can be changed into another prime (921090091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460545048 + 460545049.

It is an arithmetic number, because the mean of its divisors is an integer number (460545049).

Almost surely, 2^921090097 is an apocalyptic number.

It is an amenable number.

921090097 is a deficient number, since it is larger than the sum of its proper divisors (1).

921090097 is an equidigital number, since it uses as much as digits as its factorization.

921090097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 921090097 is about 30349.4661732295. The cubic root of 921090097 is about 972.9728108896.

The spelling of 921090097 in words is "nine hundred twenty-one million, ninety thousand, ninety-seven".