670594781 has 2 divisors, whose sum is σ = 670594782. Its totient is φ = 670594780.

The previous prime is 670594751. The next prime is 670594789. The reversal of 670594781 is 187495076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 641811556 + 28783225 = 25334^2 + 5365^2 .

It is a cyclic number.

It is not a de Polignac number, because 670594781 - 2²⁶ = 603485917 is a prime.

It is a super-2 number, since 2×670594781² = 899394720608875922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670594789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335297390 + 335297391.

It is an arithmetic number, because the mean of its divisors is an integer number (335297391).

Almost surely, 2^670594781 is an apocalyptic number.

It is an amenable number.

670594781 is a deficient number, since it is larger than the sum of its proper divisors (1).

670594781 is an equidigital number, since it uses as much as digits as its factorization.

670594781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 670594781 is about 25895.8448597454. The cubic root of 670594781 is about 875.2928678420.

The spelling of 670594781 in words is "six hundred seventy million, five hundred ninety-four thousand, seven hundred eighty-one".