371281661 has 4 divisors (see below), whose sum is σ = 371388924. Its totient is φ = 371174400.

The previous prime is 371281619. The next prime is 371281667. The reversal of 371281661 is 166182173.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166182173 = 59 ⋅2816647.

It can be written as a sum of positive squares in 2 ways, for example, as 222904900 + 148376761 = 14930^2 + 12181^2 .

It is a cyclic number.

It is not a de Polignac number, because 371281661 - 2²⁶ = 304172797 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 (371281667) 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, 48260 + ... + 55421.

It is an arithmetic number, because the mean of its divisors is an integer number (92847231).

Almost surely, 2^371281661 is an apocalyptic number.

It is an amenable number.

371281661 is a deficient number, since it is larger than the sum of its proper divisors (107263).

371281661 is a wasteful number, since it uses less digits than its factorization.

371281661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107262.

The product of its digits is 12096, while the sum is 35.

The square root of 371281661 is about 19268.6704523171. The cubic root of 371281661 is about 718.7334091092.

The spelling of 371281661 in words is "three hundred seventy-one million, two hundred eighty-one thousand, six hundred sixty-one".