78212951 has 2 divisors, whose sum is σ = 78212952. Its totient is φ = 78212950.

The previous prime is 78212941. The next prime is 78213007. The reversal of 78212951 is 15921287.

It is a weak prime.

It is an emirp because it is prime and its reverse (15921287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78212951 - 2⁶ = 78212887 is a prime.

It is a super-2 number, since 2×78212951² = 12234531408256802, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78212921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39106475 + 39106476.

It is an arithmetic number, because the mean of its divisors is an integer number (39106476).

Almost surely, 2^78212951 is an apocalyptic number.

78212951 is a deficient number, since it is larger than the sum of its proper divisors (1).

78212951 is an equidigital number, since it uses as much as digits as its factorization.

78212951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 35.

The square root of 78212951 is about 8843.8086252474. The cubic root of 78212951 is about 427.6543468753.

The spelling of 78212951 in words is "seventy-eight million, two hundred twelve thousand, nine hundred fifty-one".