491154061 has 2 divisors, whose sum is σ = 491154062. Its totient is φ = 491154060.

The previous prime is 491153989. The next prime is 491154119. The reversal of 491154061 is 160451194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 280730025 + 210424036 = 16755^2 + 14506^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491154061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491154661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245577030 + 245577031.

It is an arithmetic number, because the mean of its divisors is an integer number (245577031).

Almost surely, 2^491154061 is an apocalyptic number.

It is an amenable number.

491154061 is a deficient number, since it is larger than the sum of its proper divisors (1).

491154061 is an equidigital number, since it uses as much as digits as its factorization.

491154061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 491154061 is about 22161.9958713109. The cubic root of 491154061 is about 788.9919637769.

The spelling of 491154061 in words is "four hundred ninety-one million, one hundred fifty-four thousand, sixty-one".