61155223 has 2 divisors, whose sum is σ = 61155224. Its totient is φ = 61155222.

The previous prime is 61155221. The next prime is 61155247. The reversal of 61155223 is 32255116.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61155223 - 2¹ = 61155221 is a prime.

It is a super-2 number, since 2×61155223² = 7479922600359458, which contains 22 as substring.

Together with 61155221, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61155221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30577611 + 30577612.

It is an arithmetic number, because the mean of its divisors is an integer number (30577612).

Almost surely, 2^61155223 is an apocalyptic number.

61155223 is a deficient number, since it is larger than the sum of its proper divisors (1).

61155223 is an equidigital number, since it uses as much as digits as its factorization.

61155223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 25.

The square root of 61155223 is about 7820.1804966382. The cubic root of 61155223 is about 393.9833343462.

The spelling of 61155223 in words is "sixty-one million, one hundred fifty-five thousand, two hundred twenty-three".