70851281 has 2 divisors, whose sum is σ = 70851282. Its totient is φ = 70851280.

The previous prime is 70851241. The next prime is 70851299. The reversal of 70851281 is 18215807.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65286400 + 5564881 = 8080^2 + 2359^2 .

It is a cyclic number.

It is not a de Polignac number, because 70851281 - 2¹⁸ = 70589137 is a prime.

It is a super-2 number, since 2×70851281² = 10039808038681922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70851211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35425640 + 35425641.

It is an arithmetic number, because the mean of its divisors is an integer number (35425641).

Almost surely, 2^70851281 is an apocalyptic number.

It is an amenable number.

70851281 is a deficient number, since it is larger than the sum of its proper divisors (1).

70851281 is an equidigital number, since it uses as much as digits as its factorization.

70851281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 70851281 is about 8417.3202980521. The cubic root of 70851281 is about 413.7924562816.

The spelling of 70851281 in words is "seventy million, eight hundred fifty-one thousand, two hundred eighty-one".