1331420401 has 4 divisors (see below), whose sum is σ = 1332578304. Its totient is φ = 1330262500.

The previous prime is 1331420357. The next prime is 1331420411. The reversal of 1331420401 is 1040241331.

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 1331420401 - 2¹⁵ = 1331387633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331420411) 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, 577225 + ... + 579526.

It is an arithmetic number, because the mean of its divisors is an integer number (333144576).

Almost surely, 2^1331420401 is an apocalyptic number.

It is an amenable number.

1331420401 is a deficient number, since it is larger than the sum of its proper divisors (1157903).

1331420401 is a wasteful number, since it uses less digits than its factorization.

1331420401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157902.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1331420401 is about 36488.6338604229. The cubic root of 1331420401 is about 1100.1158007565.

Adding to 1331420401 its reverse (1040241331), we get a palindrome (2371661732).

The spelling of 1331420401 in words is "one billion, three hundred thirty-one million, four hundred twenty thousand, four hundred one".