1331545401 has 12 divisors (see below), whose sum is σ = 1925408212. Its totient is φ = 886743936.

The previous prime is 1331545399. The next prime is 1331545409. The reversal of 1331545401 is 1045451331.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 167029776 + 1164515625 = 12924^2 + 34125^2 .

It is not a de Polignac number, because 1331545401 - 2¹ = 1331545399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331545409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70516 + ... + 87381.

Almost surely, 2^1331545401 is an apocalyptic number.

It is an amenable number.

1331545401 is a deficient number, since it is larger than the sum of its proper divisors (593862811).

1331545401 is a wasteful number, since it uses less digits than its factorization.

1331545401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158840 (or 158837 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 1331545401 is about 36490.3466823761. The cubic root of 1331545401 is about 1100.1502276917.

Adding to 1331545401 its reverse (1045451331), we get a palindrome (2376996732).

The spelling of 1331545401 in words is "one billion, three hundred thirty-one million, five hundred forty-five thousand, four hundred one".