78261011 has 2 divisors, whose sum is σ = 78261012. Its totient is φ = 78261010.

The previous prime is 78260999. The next prime is 78261017. The reversal of 78261011 is 11016287.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78261011 - 2⁶ = 78260947 is a prime.

It is a super-2 number, since 2×78261011² = 12249571685484242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78261017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39130505 + 39130506.

It is an arithmetic number, because the mean of its divisors is an integer number (39130506).

Almost surely, 2^78261011 is an apocalyptic number.

78261011 is a deficient number, since it is larger than the sum of its proper divisors (1).

78261011 is an equidigital number, since it uses as much as digits as its factorization.

78261011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 78261011 is about 8846.5253631016. The cubic root of 78261011 is about 427.7419234181.

Adding to 78261011 its reverse (11016287), we get a palindrome (89277298).

The spelling of 78261011 in words is "seventy-eight million, two hundred sixty-one thousand, eleven".