70121729 has 2 divisors, whose sum is σ = 70121730. Its totient is φ = 70121728.

The previous prime is 70121717. The next prime is 70121741. The reversal of 70121729 is 92712107.

It is a balanced prime because it is at equal distance from previous prime (70121717) and next prime (70121741).

It can be written as a sum of positive squares in only one way, i.e., 62410000 + 7711729 = 7900^2 + 2777^2 .

It is a cyclic number.

It is not a de Polignac number, because 70121729 - 2¹² = 70117633 is a prime.

It is not a weakly prime, because it can be changed into another prime (70121749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35060864 + 35060865.

It is an arithmetic number, because the mean of its divisors is an integer number (35060865).

Almost surely, 2^70121729 is an apocalyptic number.

It is an amenable number.

70121729 is a deficient number, since it is larger than the sum of its proper divisors (1).

70121729 is an equidigital number, since it uses as much as digits as its factorization.

70121729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 70121729 is about 8373.8718046075. The cubic root of 70121729 is about 412.3672868447.

The spelling of 70121729 in words is "seventy million, one hundred twenty-one thousand, seven hundred twenty-nine".