674121649 has 4 divisors (see below), whose sum is σ = 677846260. Its totient is φ = 670397040.

The previous prime is 674121533. The next prime is 674121659. The reversal of 674121649 is 946121476.

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 207561649 + 466560000 = 14407^2 + 21600^2 .

It is a cyclic number.

It is not a de Polignac number, because 674121649 - 2¹³ = 674113457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (674121659) 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, 1862034 + ... + 1862395.

It is an arithmetic number, because the mean of its divisors is an integer number (169461565).

Almost surely, 2^674121649 is an apocalyptic number.

It is an amenable number.

674121649 is a deficient number, since it is larger than the sum of its proper divisors (3724611).

674121649 is a wasteful number, since it uses less digits than its factorization.

674121649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3724610.

The product of its digits is 72576, while the sum is 40.

The square root of 674121649 is about 25963.8527379894. The cubic root of 674121649 is about 876.8246653563.

The spelling of 674121649 in words is "six hundred seventy-four million, one hundred twenty-one thousand, six hundred forty-nine".