70518491 has 2 divisors, whose sum is σ = 70518492. Its totient is φ = 70518490.

The previous prime is 70518463. The next prime is 70518493. The reversal of 70518491 is 19481507.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70518491 is a prime.

It is a Sophie Germain prime.

Together with 70518493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70518493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35259245 + 35259246.

It is an arithmetic number, because the mean of its divisors is an integer number (35259246).

Almost surely, 2^70518491 is an apocalyptic number.

70518491 is a deficient number, since it is larger than the sum of its proper divisors (1).

70518491 is an equidigital number, since it uses as much as digits as its factorization.

70518491 is an evil number, because the sum of its binary digits is even.

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

The square root of 70518491 is about 8397.5288627072. The cubic root of 70518491 is about 413.1435752422.

Adding to 70518491 its reverse (19481507), we get a palindrome (89999998).

The spelling of 70518491 in words is "seventy million, five hundred eighteen thousand, four hundred ninety-one".