630891001 has 4 divisors (see below), whose sum is σ = 679421092. Its totient is φ = 582360912.

The previous prime is 630890999. The next prime is 630891017. The reversal of 630891001 is 100198036.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40449600 + 590441401 = 6360^2 + 24299^2 .

It is a cyclic number.

It is not a de Polignac number, because 630891001 - 2¹ = 630890999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630891061) 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, 24265026 + ... + 24265051.

It is an arithmetic number, because the mean of its divisors is an integer number (169855273).

Almost surely, 2^630891001 is an apocalyptic number.

It is an amenable number.

630891001 is a deficient number, since it is larger than the sum of its proper divisors (48530091).

630891001 is a wasteful number, since it uses less digits than its factorization.

630891001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48530090.

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

The square root of 630891001 is about 25117.5436896206. The cubic root of 630891001 is about 857.6658360593.

The spelling of 630891001 in words is "six hundred thirty million, eight hundred ninety-one thousand, one".