401533360991 has 32 divisors (see below), whose sum is σ = 504251274240. Its totient is φ = 311756062464.

The previous prime is 401533360957. The next prime is 401533360999. The reversal of 401533360991 is 199063335104.

It is not a de Polignac number, because 401533360991 - 2¹⁴ = 401533344607 is a prime.

It is a super-2 number, since 2×401533360991² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401533360999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8029421 + ... + 8079273.

It is an arithmetic number, because the mean of its divisors is an integer number (15757852320).

Almost surely, 2^401533360991 is an apocalyptic number.

401533360991 is a deficient number, since it is larger than the sum of its proper divisors (102717913249).

401533360991 is a wasteful number, since it uses less digits than its factorization.

401533360991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52535.

The product of its (nonzero) digits is 262440, while the sum is 44.

The spelling of 401533360991 in words is "four hundred one billion, five hundred thirty-three million, three hundred sixty thousand, nine hundred ninety-one".