920387767891 has 2 divisors, whose sum is σ = 920387767892. Its totient is φ = 920387767890.

The previous prime is 920387767841. The next prime is 920387767921. The reversal of 920387767891 is 198767783029.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 920387767891 - 2⁷ = 920387767763 is a prime.

It is a super-2 number, since 2×920387767891² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (920387767841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460193883945 + 460193883946.

It is an arithmetic number, because the mean of its divisors is an integer number (460193883946).

Almost surely, 2^920387767891 is an apocalyptic number.

920387767891 is a deficient number, since it is larger than the sum of its proper divisors (1).

920387767891 is an equidigital number, since it uses as much as digits as its factorization.

920387767891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64012032, while the sum is 67.

The spelling of 920387767891 in words is "nine hundred twenty billion, three hundred eighty-seven million, seven hundred sixty-seven thousand, eight hundred ninety-one".