2106549397 has 2 divisors, whose sum is σ = 2106549398. Its totient is φ = 2106549396.

The previous prime is 2106549391. The next prime is 2106549421. The reversal of 2106549397 is 7939456012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1682148196 + 424401201 = 41014^2 + 20601^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2106549397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2106549391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1053274698 + 1053274699.

It is an arithmetic number, because the mean of its divisors is an integer number (1053274699).

Almost surely, 2^2106549397 is an apocalyptic number.

It is an amenable number.

2106549397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2106549397 is an equidigital number, since it uses as much as digits as its factorization.

2106549397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 2106549397 is about 45897.1610995713. The cubic root of 2106549397 is about 1281.9090566351.

The spelling of 2106549397 in words is "two billion, one hundred six million, five hundred forty-nine thousand, three hundred ninety-seven".