1967345921 has 2 divisors, whose sum is σ = 1967345922. Its totient is φ = 1967345920.

The previous prime is 1967345903. The next prime is 1967345957. The reversal of 1967345921 is 1295437691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1366115521 + 601230400 = 36961^2 + 24520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1967345921 is a prime.

It is not a weakly prime, because it can be changed into another prime (1967345971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983672960 + 983672961.

It is an arithmetic number, because the mean of its divisors is an integer number (983672961).

Almost surely, 2^1967345921 is an apocalyptic number.

It is an amenable number.

1967345921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1967345921 is an equidigital number, since it uses as much as digits as its factorization.

1967345921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 47.

The square root of 1967345921 is about 44354.7733733360. The cubic root of 1967345921 is about 1253.0264629837.

The spelling of 1967345921 in words is "one billion, nine hundred sixty-seven million, three hundred forty-five thousand, nine hundred twenty-one".