70731587 has 2 divisors, whose sum is σ = 70731588. Its totient is φ = 70731586.

The previous prime is 70731581. The next prime is 70731589. The reversal of 70731587 is 78513707.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 70731587 - 2⁶ = 70731523 is a prime.

Together with 70731589, it forms a pair of twin primes.

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 70731587.

It is not a weakly prime, because it can be changed into another prime (70731581) 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, 35365793 + 35365794.

It is an arithmetic number, because the mean of its divisors is an integer number (35365794).

Almost surely, 2^70731587 is an apocalyptic number.

70731587 is a deficient number, since it is larger than the sum of its proper divisors (1).

70731587 is an equidigital number, since it uses as much as digits as its factorization.

70731587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41160, while the sum is 38.

The square root of 70731587 is about 8410.2073101678. The cubic root of 70731587 is about 413.5593088099.

The spelling of 70731587 in words is "seventy million, seven hundred thirty-one thousand, five hundred eighty-seven".