70730921 has 2 divisors, whose sum is σ = 70730922. Its totient is φ = 70730920.

The previous prime is 70730909. The next prime is 70730953. The reversal of 70730921 is 12903707.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52998400 + 17732521 = 7280^2 + 4211^2 .

It is an emirp because it is prime and its reverse (12903707) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70730921 - 2¹⁴ = 70714537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70736921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35365460 + 35365461.

It is an arithmetic number, because the mean of its divisors is an integer number (35365461).

Almost surely, 2^70730921 is an apocalyptic number.

It is an amenable number.

70730921 is a deficient number, since it is larger than the sum of its proper divisors (1).

70730921 is an equidigital number, since it uses as much as digits as its factorization.

70730921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 70730921 is about 8410.1677153312. The cubic root of 70730921 is about 413.5580107978.

The spelling of 70730921 in words is "seventy million, seven hundred thirty thousand, nine hundred twenty-one".