631326541561 has 8 divisors (see below), whose sum is σ = 634644460800. Its totient is φ = 628009105152.

The previous prime is 631326541553. The next prime is 631326541577. The reversal of 631326541561 is 165145623136.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 631326541561 - 2³ = 631326541553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631326541061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2670240 + ... + 2897038.

It is an arithmetic number, because the mean of its divisors is an integer number (79330557600).

Almost surely, 2^631326541561 is an apocalyptic number.

It is an amenable number.

631326541561 is a deficient number, since it is larger than the sum of its proper divisors (3317919239).

631326541561 is a wasteful number, since it uses less digits than its factorization.

631326541561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241415.

The product of its digits is 388800, while the sum is 43.

The spelling of 631326541561 in words is "six hundred thirty-one billion, three hundred twenty-six million, five hundred forty-one thousand, five hundred sixty-one".