70609991 has 2 divisors, whose sum is σ = 70609992. Its totient is φ = 70609990.

The previous prime is 70609967. The next prime is 70610011. The reversal of 70609991 is 19990607.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 70609991 - 2⁶ = 70609927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70609691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35304995 + 35304996.

It is an arithmetic number, because the mean of its divisors is an integer number (35304996).

Almost surely, 2^70609991 is an apocalyptic number.

70609991 is a deficient number, since it is larger than the sum of its proper divisors (1).

70609991 is an equidigital number, since it uses as much as digits as its factorization.

70609991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 70609991 is about 8402.9751278937. The cubic root of 70609991 is about 413.3221870188.

The spelling of 70609991 in words is "seventy million, six hundred nine thousand, nine hundred ninety-one".