70281989 has 2 divisors, whose sum is σ = 70281990. Its totient is φ = 70281988.

The previous prime is 70281973. The next prime is 70282019. The reversal of 70281989 is 98918207.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64240225 + 6041764 = 8015^2 + 2458^2 .

It is a cyclic number.

It is not a de Polignac number, because 70281989 - 2⁴ = 70281973 is a prime.

It is a super-2 number, since 2×70281989² = 9879115955592242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70281919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35140994 + 35140995.

It is an arithmetic number, because the mean of its divisors is an integer number (35140995).

Almost surely, 2^70281989 is an apocalyptic number.

It is an amenable number.

70281989 is a deficient number, since it is larger than the sum of its proper divisors (1).

70281989 is an equidigital number, since it uses as much as digits as its factorization.

70281989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 70281989 is about 8383.4353936796. The cubic root of 70281989 is about 412.6811966730.

It can be divided in two parts, 7028198 and 9, that added together give a palindrome (7028207).

The spelling of 70281989 in words is "seventy million, two hundred eighty-one thousand, nine hundred eighty-nine".