78313133 has 2 divisors, whose sum is σ = 78313134. Its totient is φ = 78313132.

The previous prime is 78313129. The next prime is 78313211. The reversal of 78313133 is 33131387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48260809 + 30052324 = 6947^2 + 5482^2 .

It is an emirp because it is prime and its reverse (33131387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78313133 - 2² = 78313129 is a prime.

It is a super-2 number, since 2×78313133² = 12265893600551378, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78313096 and 78313105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78313933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39156566 + 39156567.

It is an arithmetic number, because the mean of its divisors is an integer number (39156567).

Almost surely, 2^78313133 is an apocalyptic number.

It is an amenable number.

78313133 is a deficient number, since it is larger than the sum of its proper divisors (1).

78313133 is an equidigital number, since it uses as much as digits as its factorization.

78313133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 29.

The square root of 78313133 is about 8849.4707751368. The cubic root of 78313133 is about 427.8368613556.

The spelling of 78313133 in words is "seventy-eight million, three hundred thirteen thousand, one hundred thirty-three".