671011145 has 12 divisors (see below), whose sum is σ = 936677124. Its totient is φ = 460121760.

The previous prime is 671011141. The next prime is 671011157. The reversal of 671011145 is 541110176.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 127328656 + 543682489 = 11284^2 + 23317^2 .

It is not a de Polignac number, because 671011145 - 2² = 671011141 is a prime.

It is a super-2 number, since 2×671011145² = 900511913428422050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671011141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1369166 + ... + 1369655.

It is an arithmetic number, because the mean of its divisors is an integer number (78056427).

Almost surely, 2^671011145 is an apocalyptic number.

It is an amenable number.

671011145 is a deficient number, since it is larger than the sum of its proper divisors (265665979).

671011145 is a wasteful number, since it uses less digits than its factorization.

671011145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738840 (or 2738833 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 671011145 is about 25903.8828170605. The cubic root of 671011145 is about 875.4739831993.

The spelling of 671011145 in words is "six hundred seventy-one million, eleven thousand, one hundred forty-five".