220155391 has 2 divisors, whose sum is σ = 220155392. Its totient is φ = 220155390.

The previous prime is 220155361. The next prime is 220155407. The reversal of 220155391 is 193551022.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 220155391 - 2²³ = 211766783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220155311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110077695 + 110077696.

It is an arithmetic number, because the mean of its divisors is an integer number (110077696).

Almost surely, 2^220155391 is an apocalyptic number.

220155391 is a deficient number, since it is larger than the sum of its proper divisors (1).

220155391 is an equidigital number, since it uses as much as digits as its factorization.

220155391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 220155391 is about 14837.6342790891. The cubic root of 220155391 is about 603.8231714502.

The spelling of 220155391 in words is "two hundred twenty million, one hundred fifty-five thousand, three hundred ninety-one".