222157861 has 16 divisors (see below), whose sum is σ = 240249600. Its totient is φ = 204761088.

The previous prime is 222157843. The next prime is 222157877. The reversal of 222157861 is 168751222.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 222157861 - 2¹⁵ = 222125093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222157801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171705 + ... + 172993.

It is an arithmetic number, because the mean of its divisors is an integer number (15015600).

Almost surely, 2^222157861 is an apocalyptic number.

It is an amenable number.

222157861 is a deficient number, since it is larger than the sum of its proper divisors (18091739).

222157861 is a wasteful number, since it uses less digits than its factorization.

222157861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548.

The product of its digits is 13440, while the sum is 34.

The square root of 222157861 is about 14904.9609526493. The cubic root of 222157861 is about 605.6483825799.

The spelling of 222157861 in words is "two hundred twenty-two million, one hundred fifty-seven thousand, eight hundred sixty-one".