391877141 has 2 divisors, whose sum is σ = 391877142. Its totient is φ = 391877140.

The previous prime is 391877131. The next prime is 391877153. The reversal of 391877141 is 141778193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 373301041 + 18576100 = 19321^2 + 4310^2 .

It is a cyclic number.

It is not a de Polignac number, because 391877141 - 2⁶ = 391877077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391877131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195938570 + 195938571.

It is an arithmetic number, because the mean of its divisors is an integer number (195938571).

Almost surely, 2^391877141 is an apocalyptic number.

It is an amenable number.

391877141 is a deficient number, since it is larger than the sum of its proper divisors (1).

391877141 is an equidigital number, since it uses as much as digits as its factorization.

391877141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 41.

The square root of 391877141 is about 19795.8869717929. The cubic root of 391877141 is about 731.7846750630.

The spelling of 391877141 in words is "three hundred ninety-one million, eight hundred seventy-seven thousand, one hundred forty-one".