674640091 has 2 divisors, whose sum is σ = 674640092. Its totient is φ = 674640090.

The previous prime is 674640061. The next prime is 674640107. The reversal of 674640091 is 190046476.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 674640091 - 2¹³ = 674631899 is a prime.

It is a super-4 number, since 4×674640091⁴ (a number of 36 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 674640091.

It is not a weakly prime, because it can be changed into another prime (674640061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337320045 + 337320046.

It is an arithmetic number, because the mean of its divisors is an integer number (337320046).

Almost surely, 2^674640091 is an apocalyptic number.

674640091 is a deficient number, since it is larger than the sum of its proper divisors (1).

674640091 is an equidigital number, since it uses as much as digits as its factorization.

674640091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 674640091 is about 25973.8347380590. The cubic root of 674640091 is about 877.0493855530.

The spelling of 674640091 in words is "six hundred seventy-four million, six hundred forty thousand, ninety-one".