401013121 has 4 divisors (see below), whose sum is σ = 402764500. Its totient is φ = 399261744.

The previous prime is 401013113. The next prime is 401013149. The reversal of 401013121 is 121310104.

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 273571600 + 127441521 = 16540^2 + 11289^2 .

It is a cyclic number.

It is not a de Polignac number, because 401013121 - 2³ = 401013113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401013191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 875346 + ... + 875803.

It is an arithmetic number, because the mean of its divisors is an integer number (100691125).

Almost surely, 2^401013121 is an apocalyptic number.

It is an amenable number.

401013121 is a deficient number, since it is larger than the sum of its proper divisors (1751379).

401013121 is a wasteful number, since it uses less digits than its factorization.

401013121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751378.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 401013121 is about 20025.3120075568. The cubic root of 401013121 is about 737.4278368921.

Adding to 401013121 its reverse (121310104), we get a palindrome (522323225).

The spelling of 401013121 in words is "four hundred one million, thirteen thousand, one hundred twenty-one".