611550161 has 2 divisors, whose sum is σ = 611550162. Its totient is φ = 611550160.

The previous prime is 611550007. The next prime is 611550167. The reversal of 611550161 is 161055116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314849536 + 296700625 = 17744^2 + 17225^2 .

It is a cyclic number.

It is not a de Polignac number, because 611550161 - 2²² = 607355857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 611550161.

It is not a weakly prime, because it can be changed into another prime (611550167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305775080 + 305775081.

It is an arithmetic number, because the mean of its divisors is an integer number (305775081).

Almost surely, 2^611550161 is an apocalyptic number.

It is an amenable number.

611550161 is a deficient number, since it is larger than the sum of its proper divisors (1).

611550161 is an equidigital number, since it uses as much as digits as its factorization.

611550161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 611550161 is about 24729.5402504778. The cubic root of 611550161 is about 848.8104055776.

The spelling of 611550161 in words is "six hundred eleven million, five hundred fifty thousand, one hundred sixty-one".