670155121 has 4 divisors (see below), whose sum is σ = 670285044. Its totient is φ = 670025200.

The previous prime is 670155119. The next prime is 670155131. The reversal of 670155121 is 121551076.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66912400 + 603242721 = 8180^2 + 24561^2 .

It is a cyclic number.

It is not a de Polignac number, because 670155121 - 2¹ = 670155119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 670155121.

It is not an unprimeable number, because it can be changed into a prime (670155131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56890 + ... + 67651.

It is an arithmetic number, because the mean of its divisors is an integer number (167571261).

Almost surely, 2^670155121 is an apocalyptic number.

It is an amenable number.

670155121 is a deficient number, since it is larger than the sum of its proper divisors (129923).

670155121 is a wasteful number, since it uses less digits than its factorization.

670155121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129922.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 670155121 is about 25887.3544612036. The cubic root of 670155121 is about 875.1015374958.

The spelling of 670155121 in words is "six hundred seventy million, one hundred fifty-five thousand, one hundred twenty-one".