161140621 has 2 divisors, whose sum is σ = 161140622. Its totient is φ = 161140620.

The previous prime is 161140613. The next prime is 161140643. The reversal of 161140621 is 126041161.

It is an a-pointer prime, because the next prime (161140643) can be obtained adding 161140621 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93818596 + 67322025 = 9686^2 + 8205^2 .

It is a cyclic number.

It is not a de Polignac number, because 161140621 - 2³ = 161140613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161140592 and 161140601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161140601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80570310 + 80570311.

It is an arithmetic number, because the mean of its divisors is an integer number (80570311).

Almost surely, 2^161140621 is an apocalyptic number.

It is an amenable number.

161140621 is a deficient number, since it is larger than the sum of its proper divisors (1).

161140621 is an equidigital number, since it uses as much as digits as its factorization.

161140621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 161140621 is about 12694.1175746879. The cubic root of 161140621 is about 544.1705205866.

Adding to 161140621 its reverse (126041161), we get a palindrome (287181782).

The spelling of 161140621 in words is "one hundred sixty-one million, one hundred forty thousand, six hundred twenty-one".