161498261 has 8 divisors (see below), whose sum is σ = 164861784. Its totient is φ = 158146560.

The previous prime is 161498237. The next prime is 161498263. The reversal of 161498261 is 162894161.

It can be written as a sum of positive squares in 4 ways, for example, as 59367025 + 102131236 = 7705^2 + 10106^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161498261 - 2¹⁴ = 161481877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161498263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27941 + ... + 33221.

It is an arithmetic number, because the mean of its divisors is an integer number (20607723).

Almost surely, 2^161498261 is an apocalyptic number.

It is an amenable number.

161498261 is a deficient number, since it is larger than the sum of its proper divisors (3363523).

161498261 is an equidigital number, since it uses as much as digits as its factorization.

161498261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5911.

The product of its digits is 20736, while the sum is 38.

The square root of 161498261 is about 12708.1966069148. The cubic root of 161498261 is about 544.5728055421.

The spelling of 161498261 in words is "one hundred sixty-one million, four hundred ninety-eight thousand, two hundred sixty-one".