371275721 has 4 divisors (see below), whose sum is σ = 371408532. Its totient is φ = 371142912.

The previous prime is 371275711. The next prime is 371275753. The reversal of 371275721 is 127572173.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127572173 = 8933 ⋅14281.

It can be written as a sum of positive squares in 2 ways, for example, as 229189321 + 142086400 = 15139^2 + 11920^2 .

It is a cyclic number.

It is not a de Polignac number, because 371275721 - 2¹⁰ = 371274697 is a prime.

It is a super-2 number, since 2×371275721² = 275691322008139682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (371275711) 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, 62120 + ... + 67833.

It is an arithmetic number, because the mean of its divisors is an integer number (92852133).

Almost surely, 2^371275721 is an apocalyptic number.

It is an amenable number.

371275721 is a deficient number, since it is larger than the sum of its proper divisors (132811).

371275721 is a wasteful number, since it uses less digits than its factorization.

371275721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132810.

The product of its digits is 20580, while the sum is 35.

The square root of 371275721 is about 19268.5163154821. The cubic root of 371275721 is about 718.7295761707.

The spelling of 371275721 in words is "three hundred seventy-one million, two hundred seventy-five thousand, seven hundred twenty-one".