1621069061 has 2 divisors, whose sum is σ = 1621069062. Its totient is φ = 1621069060.

The previous prime is 1621069007. The next prime is 1621069091. The reversal of 1621069061 is 1609601261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1206172900 + 414896161 = 34730^2 + 20369^2 .

It is a cyclic number.

It is not a de Polignac number, because 1621069061 - 2¹⁸ = 1620806917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621069091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810534530 + 810534531.

It is an arithmetic number, because the mean of its divisors is an integer number (810534531).

Almost surely, 2^1621069061 is an apocalyptic number.

It is an amenable number.

1621069061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621069061 is an equidigital number, since it uses as much as digits as its factorization.

1621069061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1621069061 is about 40262.5019217634. The cubic root of 1621069061 is about 1174.7185832162.

The spelling of 1621069061 in words is "one billion, six hundred twenty-one million, sixty-nine thousand, sixty-one".