78150731 has 2 divisors, whose sum is σ = 78150732. Its totient is φ = 78150730.

The previous prime is 78150727. The next prime is 78150769. The reversal of 78150731 is 13705187.

It is a weak prime.

It is an emirp because it is prime and its reverse (13705187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78150731 - 2² = 78150727 is a prime.

It is a super-2 number, since 2×78150731² = 12215073511668722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78150131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39075365 + 39075366.

It is an arithmetic number, because the mean of its divisors is an integer number (39075366).

Almost surely, 2^78150731 is an apocalyptic number.

78150731 is a deficient number, since it is larger than the sum of its proper divisors (1).

78150731 is an equidigital number, since it uses as much as digits as its factorization.

78150731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 78150731 is about 8840.2902101684. The cubic root of 78150731 is about 427.5409142014.

The spelling of 78150731 in words is "seventy-eight million, one hundred fifty thousand, seven hundred thirty-one".