213748612109 has 2 divisors, whose sum is σ = 213748612110. Its totient is φ = 213748612108.

The previous prime is 213748612087. The next prime is 213748612127. The reversal of 213748612109 is 901216847312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148406005225 + 65342606884 = 385235^2 + 255622^2 .

It is a cyclic number.

It is not a de Polignac number, because 213748612109 - 2²⁴ = 213731834893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213748612109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213748612009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106874306054 + 106874306055.

It is an arithmetic number, because the mean of its divisors is an integer number (106874306055).

Almost surely, 2^213748612109 is an apocalyptic number.

It is an amenable number.

213748612109 is a deficient number, since it is larger than the sum of its proper divisors (1).

213748612109 is an equidigital number, since it uses as much as digits as its factorization.

213748612109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 213748612109 in words is "two hundred thirteen billion, seven hundred forty-eight million, six hundred twelve thousand, one hundred nine".