70753721 has 2 divisors, whose sum is σ = 70753722. Its totient is φ = 70753720.

The previous prime is 70753703. The next prime is 70753723. The reversal of 70753721 is 12735707.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38887696 + 31866025 = 6236^2 + 5645^2 .

It is a cyclic number.

It is not a de Polignac number, because 70753721 - 2¹⁰ = 70752697 is a prime.

Together with 70753723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70753723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35376860 + 35376861.

It is an arithmetic number, because the mean of its divisors is an integer number (35376861).

Almost surely, 2^70753721 is an apocalyptic number.

It is an amenable number.

70753721 is a deficient number, since it is larger than the sum of its proper divisors (1).

70753721 is an equidigital number, since it uses as much as digits as its factorization.

70753721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10290, while the sum is 32.

The square root of 70753721 is about 8411.5231082129. The cubic root of 70753721 is about 413.6024426132.

The spelling of 70753721 in words is "seventy million, seven hundred fifty-three thousand, seven hundred twenty-one".