70698521 has 2 divisors, whose sum is σ = 70698522. Its totient is φ = 70698520.

The previous prime is 70698517. The next prime is 70698533. The reversal of 70698521 is 12589607.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66015625 + 4682896 = 8125^2 + 2164^2 .

It is a cyclic number.

It is not a de Polignac number, because 70698521 - 2² = 70698517 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (70698581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35349260 + 35349261.

It is an arithmetic number, because the mean of its divisors is an integer number (35349261).

Almost surely, 2^70698521 is an apocalyptic number.

It is an amenable number.

70698521 is a deficient number, since it is larger than the sum of its proper divisors (1).

70698521 is an equidigital number, since it uses as much as digits as its factorization.

70698521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 70698521 is about 8408.2412548642. The cubic root of 70698521 is about 413.4948544214.

The spelling of 70698521 in words is "seventy million, six hundred ninety-eight thousand, five hundred twenty-one".