70251509 has 2 divisors, whose sum is σ = 70251510. Its totient is φ = 70251508.

The previous prime is 70251457. The next prime is 70251521. The reversal of 70251509 is 90515207.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35700625 + 34550884 = 5975^2 + 5878^2 .

It is a cyclic number.

It is not a de Polignac number, because 70251509 - 2¹² = 70247413 is a prime.

It is a super-5 number, since 5×70251509⁵ (a number of 40 digits) contains 55555 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70251529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35125754 + 35125755.

It is an arithmetic number, because the mean of its divisors is an integer number (35125755).

Almost surely, 2^70251509 is an apocalyptic number.

It is an amenable number.

70251509 is a deficient number, since it is larger than the sum of its proper divisors (1).

70251509 is an equidigital number, since it uses as much as digits as its factorization.

70251509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 70251509 is about 8381.6173260296. The cubic root of 70251509 is about 412.6215306436.

The spelling of 70251509 in words is "seventy million, two hundred fifty-one thousand, five hundred nine".