921799061 has 2 divisors, whose sum is σ = 921799062. Its totient is φ = 921799060.

The previous prime is 921799009. The next prime is 921799069. The reversal of 921799061 is 160997129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 853224100 + 68574961 = 29210^2 + 8281^2 .

It is an emirp because it is prime and its reverse (160997129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 921799061 - 2¹⁴ = 921782677 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921799069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460899530 + 460899531.

It is an arithmetic number, because the mean of its divisors is an integer number (460899531).

Almost surely, 2^921799061 is an apocalyptic number.

It is an amenable number.

921799061 is a deficient number, since it is larger than the sum of its proper divisors (1).

921799061 is an equidigital number, since it uses as much as digits as its factorization.

921799061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 44.

The square root of 921799061 is about 30361.1439343118. The cubic root of 921799061 is about 973.2223795956. Note that the first 3 decimals are identical.

The spelling of 921799061 in words is "nine hundred twenty-one million, seven hundred ninety-nine thousand, sixty-one".