70633909 has 2 divisors, whose sum is σ = 70633910. Its totient is φ = 70633908.

The previous prime is 70633883. The next prime is 70633919. The reversal of 70633909 is 90933607.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68392900 + 2241009 = 8270^2 + 1497^2 .

It is an emirp because it is prime and its reverse (90933607) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70633909 - 2⁵ = 70633877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70633919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35316954 + 35316955.

It is an arithmetic number, because the mean of its divisors is an integer number (35316955).

Almost surely, 2^70633909 is an apocalyptic number.

It is an amenable number.

70633909 is a deficient number, since it is larger than the sum of its proper divisors (1).

70633909 is an equidigital number, since it uses as much as digits as its factorization.

70633909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 37.

The square root of 70633909 is about 8404.3981938031. The cubic root of 70633909 is about 413.3688505004.

The spelling of 70633909 in words is "seventy million, six hundred thirty-three thousand, nine hundred nine".