921561967 has 2 divisors, whose sum is σ = 921561968. Its totient is φ = 921561966.

The previous prime is 921561943. The next prime is 921562009. The reversal of 921561967 is 769165129.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921561967 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 (921561917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460780983 + 460780984.

It is an arithmetic number, because the mean of its divisors is an integer number (460780984).

Almost surely, 2^921561967 is an apocalyptic number.

921561967 is a deficient number, since it is larger than the sum of its proper divisors (1).

921561967 is an equidigital number, since it uses as much as digits as its factorization.

921561967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 46.

The square root of 921561967 is about 30357.2391201835. The cubic root of 921561967 is about 973.1389322796.

The spelling of 921561967 in words is "nine hundred twenty-one million, five hundred sixty-one thousand, nine hundred sixty-seven".