921690061 has 2 divisors, whose sum is σ = 921690062. Its totient is φ = 921690060.

The previous prime is 921690031. The next prime is 921690067. The reversal of 921690061 is 160096129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 812592036 + 109098025 = 28506^2 + 10445^2 .

It is a cyclic number.

It is not a de Polignac number, because 921690061 - 2¹¹ = 921688013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 921689999 and 921690026.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921690067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460845030 + 460845031.

It is an arithmetic number, because the mean of its divisors is an integer number (460845031).

Almost surely, 2^921690061 is an apocalyptic number.

It is an amenable number.

921690061 is a deficient number, since it is larger than the sum of its proper divisors (1).

921690061 is an equidigital number, since it uses as much as digits as its factorization.

921690061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 921690061 is about 30359.3488237149. The cubic root of 921690061 is about 973.1840178653.

The spelling of 921690061 in words is "nine hundred twenty-one million, six hundred ninety thousand, sixty-one".