61278911 has 2 divisors, whose sum is σ = 61278912. Its totient is φ = 61278910.

The previous prime is 61278907. The next prime is 61278947. The reversal of 61278911 is 11987216.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61278911 - 2² = 61278907 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 (61278961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30639455 + 30639456.

It is an arithmetic number, because the mean of its divisors is an integer number (30639456).

Almost surely, 2^61278911 is an apocalyptic number.

61278911 is a deficient number, since it is larger than the sum of its proper divisors (1).

61278911 is an equidigital number, since it uses as much as digits as its factorization.

61278911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 35.

The square root of 61278911 is about 7828.0847593776. The cubic root of 61278911 is about 394.2487692614.

The spelling of 61278911 in words is "sixty-one million, two hundred seventy-eight thousand, nine hundred eleven".