161260501 has 2 divisors, whose sum is σ = 161260502. Its totient is φ = 161260500.

The previous prime is 161260499. The next prime is 161260507. The reversal of 161260501 is 105062161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150038001 + 11222500 = 12249^2 + 3350^2 .

It is a cyclic number.

It is not a de Polignac number, because 161260501 - 2¹ = 161260499 is a prime.

Together with 161260499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161260507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80630250 + 80630251.

It is an arithmetic number, because the mean of its divisors is an integer number (80630251).

Almost surely, 2^161260501 is an apocalyptic number.

It is an amenable number.

161260501 is a deficient number, since it is larger than the sum of its proper divisors (1).

161260501 is an equidigital number, since it uses as much as digits as its factorization.

161260501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 161260501 is about 12698.8385689401. The cubic root of 161260501 is about 544.3054317202.

The spelling of 161260501 in words is "one hundred sixty-one million, two hundred sixty thousand, five hundred one".