672559991 has 2 divisors, whose sum is σ = 672559992. Its totient is φ = 672559990.

The previous prime is 672559919. The next prime is 672560017. The reversal of 672559991 is 199955276.

It is a happy number.

Together with previous prime (672559919) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 672559991 - 2¹⁰ = 672558967 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (672559091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336279995 + 336279996.

It is an arithmetic number, because the mean of its divisors is an integer number (336279996).

Almost surely, 2^672559991 is an apocalyptic number.

672559991 is a deficient number, since it is larger than the sum of its proper divisors (1).

672559991 is an equidigital number, since it uses as much as digits as its factorization.

672559991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1530900, while the sum is 53.

The square root of 672559991 is about 25933.7616052897. The cubic root of 672559991 is about 876.1470631344.

The spelling of 672559991 in words is "six hundred seventy-two million, five hundred fifty-nine thousand, nine hundred ninety-one".