67921949 has 2 divisors, whose sum is σ = 67921950. Its totient is φ = 67921948.

The previous prime is 67921943. The next prime is 67921951. The reversal of 67921949 is 94912976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45292900 + 22629049 = 6730^2 + 4757^2 .

It is a cyclic number.

It is not a de Polignac number, because 67921949 - 2²⁴ = 51144733 is a prime.

It is a super-2 number, since 2×67921949² = 9226782311917202, which contains 22 as substring.

Together with 67921951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67921943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33960974 + 33960975.

It is an arithmetic number, because the mean of its divisors is an integer number (33960975).

Almost surely, 2^67921949 is an apocalyptic number.

It is an amenable number.

67921949 is a deficient number, since it is larger than the sum of its proper divisors (1).

67921949 is an equidigital number, since it uses as much as digits as its factorization.

67921949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 47.

The square root of 67921949 is about 8241.4773554260. The cubic root of 67921949 is about 408.0092850796.

The spelling of 67921949 in words is "sixty-seven million, nine hundred twenty-one thousand, nine hundred forty-nine".