2155022061 has 4 divisors (see below), whose sum is σ = 2873362752. Its totient is φ = 1436681372.

The previous prime is 2155022057. The next prime is 2155022069. The reversal of 2155022061 is 1602205512.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2155022061 - 2² = 2155022057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155022069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359170341 + ... + 359170346.

It is an arithmetic number, because the mean of its divisors is an integer number (718340688).

Almost surely, 2^2155022061 is an apocalyptic number.

It is an amenable number.

2155022061 is a deficient number, since it is larger than the sum of its proper divisors (718340691).

2155022061 is an equidigital number, since it uses as much as digits as its factorization.

2155022061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718340690.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 2155022061 is about 46422.2151668789. The cubic root of 2155022061 is about 1291.6670275647.

Adding to 2155022061 its reverse (1602205512), we get a palindrome (3757227573).

The spelling of 2155022061 in words is "two billion, one hundred fifty-five million, twenty-two thousand, sixty-one".