90161641 has 4 divisors (see below), whose sum is σ = 90218884. Its totient is φ = 90104400.

The previous prime is 90161629. The next prime is 90161653. The reversal of 90161641 is 14616109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14616109 = 23 ⋅635483.

It is an interprime number because it is at equal distance from previous prime (90161629) and next prime (90161653).

It can be written as a sum of positive squares in 2 ways, for example, as 33686416 + 56475225 = 5804^2 + 7515^2 .

It is a cyclic number.

It is not a de Polignac number, because 90161641 - 2¹¹ = 90159593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90161681) 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, 26190 + ... + 29431.

It is an arithmetic number, because the mean of its divisors is an integer number (22554721).

Almost surely, 2^90161641 is an apocalyptic number.

It is an amenable number.

90161641 is a deficient number, since it is larger than the sum of its proper divisors (57243).

90161641 is a wasteful number, since it uses less digits than its factorization.

90161641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57242.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 90161641 is about 9495.3483875001. The cubic root of 90161641 is about 448.4086026234.

The spelling of 90161641 in words is "ninety million, one hundred sixty-one thousand, six hundred forty-one".