70731251 has 2 divisors, whose sum is σ = 70731252. Its totient is φ = 70731250.

The previous prime is 70731229. The next prime is 70731277. The reversal of 70731251 is 15213707.

It is an a-pointer prime, because the next prime (70731277) can be obtained adding 70731251 to its sum of digits (26).

It is a weak prime.

It is an emirp because it is prime and its reverse (15213707) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70731251 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70731251.

It is not a weakly prime, because it can be changed into another prime (70731211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35365625 + 35365626.

It is an arithmetic number, because the mean of its divisors is an integer number (35365626).

Almost surely, 2^70731251 is an apocalyptic number.

70731251 is a deficient number, since it is larger than the sum of its proper divisors (1).

70731251 is an equidigital number, since it uses as much as digits as its factorization.

70731251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 70731251 is about 8410.1873344177. The cubic root of 70731251 is about 413.5586539580.

Adding to 70731251 its reverse (15213707), we get a palindrome (85944958).

The spelling of 70731251 in words is "seventy million, seven hundred thirty-one thousand, two hundred fifty-one".