67613971 has 2 divisors, whose sum is σ = 67613972. Its totient is φ = 67613970.

The previous prime is 67613933. The next prime is 67613977. The reversal of 67613971 is 17931676.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67613971 - 2⁹ = 67613459 is a prime.

It is not a weakly prime, because it can be changed into another prime (67613977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33806985 + 33806986.

It is an arithmetic number, because the mean of its divisors is an integer number (33806986).

Almost surely, 2^67613971 is an apocalyptic number.

67613971 is a deficient number, since it is larger than the sum of its proper divisors (1).

67613971 is an equidigital number, since it uses as much as digits as its factorization.

67613971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47628, while the sum is 40.

The square root of 67613971 is about 8222.7714914133. The cubic root of 67613971 is about 407.3916728127.

The spelling of 67613971 in words is "sixty-seven million, six hundred thirteen thousand, nine hundred seventy-one".