890643601 has 4 divisors (see below), whose sum is σ = 937519600. Its totient is φ = 843767604.

The previous prime is 890643599. The next prime is 890643629. The reversal of 890643601 is 106346098.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 890643601 - 2¹ = 890643599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (890643101) 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, 23437971 + ... + 23438008.

It is an arithmetic number, because the mean of its divisors is an integer number (234379900).

Almost surely, 2^890643601 is an apocalyptic number.

It is an amenable number.

890643601 is a deficient number, since it is larger than the sum of its proper divisors (46875999).

890643601 is a wasteful number, since it uses less digits than its factorization.

890643601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46875998.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 890643601 is about 29843.6526082180. The cubic root of 890643601 is about 962.1319808750.

Adding to 890643601 its reverse (106346098), we get a palindrome (996989699).

It can be divided in two parts, 89064 and 3601, that added together give a triangular number (92665 = T₄₃₀).

The spelling of 890643601 in words is "eight hundred ninety million, six hundred forty-three thousand, six hundred one".