2101554839 has 2 divisors, whose sum is σ = 2101554840. Its totient is φ = 2101554838.

The previous prime is 2101554817. The next prime is 2101554853. The reversal of 2101554839 is 9384551012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2101554839 - 2¹⁶ = 2101489303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101554239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050777419 + 1050777420.

It is an arithmetic number, because the mean of its divisors is an integer number (1050777420).

Almost surely, 2^2101554839 is an apocalyptic number.

2101554839 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101554839 is an equidigital number, since it uses as much as digits as its factorization.

2101554839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 2101554839 is about 45842.7184948711. The cubic root of 2101554839 is about 1280.8951337539.

The spelling of 2101554839 in words is "two billion, one hundred one million, five hundred fifty-four thousand, eight hundred thirty-nine".