1620222061 has 2 divisors, whose sum is σ = 1620222062. Its totient is φ = 1620222060.

The previous prime is 1620222053. The next prime is 1620222067. The reversal of 1620222061 is 1602220261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1486102500 + 134119561 = 38550^2 + 11581^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620222061 - 2³ = 1620222053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620222067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810111030 + 810111031.

It is an arithmetic number, because the mean of its divisors is an integer number (810111031).

Almost surely, 2^1620222061 is an apocalyptic number.

It is an amenable number.

1620222061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620222061 is an equidigital number, since it uses as much as digits as its factorization.

1620222061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1620222061 is about 40251.9820754208. The cubic root of 1620222061 is about 1174.5139528263.

The spelling of 1620222061 in words is "one billion, six hundred twenty million, two hundred twenty-two thousand, sixty-one".