61999967 has 2 divisors, whose sum is σ = 61999968. Its totient is φ = 61999966.

The previous prime is 61999897. The next prime is 61999997. The reversal of 61999967 is 76999916.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61999967 - 2¹⁰ = 61998943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61999997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30999983 + 30999984.

It is an arithmetic number, because the mean of its divisors is an integer number (30999984).

Almost surely, 2^61999967 is an apocalyptic number.

61999967 is a deficient number, since it is larger than the sum of its proper divisors (1).

61999967 is an equidigital number, since it uses as much as digits as its factorization.

61999967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1653372, while the sum is 56.

The square root of 61999967 is about 7874.0057785094. The cubic root of 61999967 is about 395.7890907474.

The spelling of 61999967 in words is "sixty-one million, nine hundred ninety-nine thousand, nine hundred sixty-seven".