161560501 has 2 divisors, whose sum is σ = 161560502. Its totient is φ = 161560500.

The previous prime is 161560489. The next prime is 161560519. The reversal of 161560501 is 105065161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148815601 + 12744900 = 12199^2 + 3570^2 .

It is a cyclic number.

It is not a de Polignac number, because 161560501 - 2¹⁵ = 161527733 is a prime.

It is a super-2 number, since 2×161560501² = 52203590966742002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161500501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80780250 + 80780251.

It is an arithmetic number, because the mean of its divisors is an integer number (80780251).

Almost surely, 2^161560501 is an apocalyptic number.

It is an amenable number.

161560501 is a deficient number, since it is larger than the sum of its proper divisors (1).

161560501 is an equidigital number, since it uses as much as digits as its factorization.

161560501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 161560501 is about 12710.6451842540. The cubic root of 161560501 is about 544.6427544030.

The spelling of 161560501 in words is "one hundred sixty-one million, five hundred sixty thousand, five hundred one".