161276501 has 4 divisors (see below), whose sum is σ = 170763372. Its totient is φ = 151789632.

The previous prime is 161276461. The next prime is 161276513. The reversal of 161276501 is 105672161.

161276501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 105672161 = 7 ⋅15096023.

It can be written as a sum of positive squares in 2 ways, for example, as 148815601 + 12460900 = 12199^2 + 3530^2 .

It is a cyclic number.

It is not a de Polignac number, because 161276501 - 2¹⁴ = 161260117 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161276581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4743410 + ... + 4743443.

It is an arithmetic number, because the mean of its divisors is an integer number (42690843).

Almost surely, 2^161276501 is an apocalyptic number.

It is an amenable number.

161276501 is a deficient number, since it is larger than the sum of its proper divisors (9486871).

161276501 is an equidigital number, since it uses as much as digits as its factorization.

161276501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9486870.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 161276501 is about 12699.4685321867. The cubic root of 161276501 is about 544.3234328195.

The spelling of 161276501 in words is "one hundred sixty-one million, two hundred seventy-six thousand, five hundred one".