78513133 has 2 divisors, whose sum is σ = 78513134. Its totient is φ = 78513132.

The previous prime is 78513107. The next prime is 78513181. The reversal of 78513133 is 33131587.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59876644 + 18636489 = 7738^2 + 4317^2 .

It is a cyclic number.

It is not a de Polignac number, because 78513133 - 2¹⁷ = 78382061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78513095 and 78513104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78516133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39256566 + 39256567.

It is an arithmetic number, because the mean of its divisors is an integer number (39256567).

Almost surely, 2^78513133 is an apocalyptic number.

It is an amenable number.

78513133 is a deficient number, since it is larger than the sum of its proper divisors (1).

78513133 is an equidigital number, since it uses as much as digits as its factorization.

78513133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

The square root of 78513133 is about 8860.7636804059. The cubic root of 78513133 is about 428.2007621476.

The spelling of 78513133 in words is "seventy-eight million, five hundred thirteen thousand, one hundred thirty-three".