70406509 has 2 divisors, whose sum is σ = 70406510. Its totient is φ = 70406508.

The previous prime is 70406491. The next prime is 70406513. The reversal of 70406509 is 90560407.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40921609 + 29484900 = 6397^2 + 5430^2 .

It is a cyclic number.

It is not a de Polignac number, because 70406509 - 2⁵ = 70406477 is a prime.

It is equal to p_4140589 and since 70406509 and 4140589 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70406579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35203254 + 35203255.

It is an arithmetic number, because the mean of its divisors is an integer number (35203255).

Almost surely, 2^70406509 is an apocalyptic number.

It is an amenable number.

70406509 is a deficient number, since it is larger than the sum of its proper divisors (1).

70406509 is an equidigital number, since it uses as much as digits as its factorization.

70406509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 70406509 is about 8390.8586568956. The cubic root of 70406509 is about 412.9247713799.

The spelling of 70406509 in words is "seventy million, four hundred six thousand, five hundred nine".