1011320401 has 16 divisors (see below), whose sum is σ = 1268193024. Its totient is φ = 785064384.

The previous prime is 1011320399. The next prime is 1011320407. The reversal of 1011320401 is 1040231101.

It is not a de Polignac number, because 1011320401 - 2¹ = 1011320399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (1011320407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100021 + ... + 109666.

It is an arithmetic number, because the mean of its divisors is an integer number (79262064).

Almost surely, 2^1011320401 is an apocalyptic number.

It is an amenable number.

1011320401 is a deficient number, since it is larger than the sum of its proper divisors (256872623).

1011320401 is a wasteful number, since it uses less digits than its factorization.

1011320401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209760.

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

The square root of 1011320401 is about 31801.2641415400. The cubic root of 1011320401 is about 1003.7593168275.

Adding to 1011320401 its reverse (1040231101), we get a palindrome (2051551502).

The spelling of 1011320401 in words is "one billion, eleven million, three hundred twenty thousand, four hundred one".