70121789 has 2 divisors, whose sum is σ = 70121790. Its totient is φ = 70121788.

The previous prime is 70121759. The next prime is 70121827. The reversal of 70121789 is 98712107.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64080025 + 6041764 = 8005^2 + 2458^2 .

It is a cyclic number.

It is not a de Polignac number, because 70121789 - 2¹² = 70117693 is a prime.

It is a Chen prime.

It is equal to p_4124798 and since 70121789 and 4124798 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70121729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35060894 + 35060895.

It is an arithmetic number, because the mean of its divisors is an integer number (35060895).

Almost surely, 2^70121789 is an apocalyptic number.

It is an amenable number.

70121789 is a deficient number, since it is larger than the sum of its proper divisors (1).

70121789 is an equidigital number, since it uses as much as digits as its factorization.

70121789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 70121789 is about 8373.8753871789. The cubic root of 70121789 is about 412.3674044594.

The spelling of 70121789 in words is "seventy million, one hundred twenty-one thousand, seven hundred eighty-nine".