1320233551 has 32 divisors (see below), whose sum is σ = 1662571008. Its totient is φ = 1020539520.

The previous prime is 1320233527. The next prime is 1320233573. The reversal of 1320233551 is 1553320231.

It is not a de Polignac number, because 1320233551 - 2¹⁹ = 1319709263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320233591) 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, 1596000 + ... + 1596826.

It is an arithmetic number, because the mean of its divisors is an integer number (51955344).

Almost surely, 2^1320233551 is an apocalyptic number.

1320233551 is a deficient number, since it is larger than the sum of its proper divisors (342337457).

1320233551 is a wasteful number, since it uses less digits than its factorization.

1320233551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 1320233551 is about 36335.0182468648. The cubic root of 1320233551 is about 1097.0260027347.

Adding to 1320233551 its reverse (1553320231), we get a palindrome (2873553782).

The spelling of 1320233551 in words is "one billion, three hundred twenty million, two hundred thirty-three thousand, five hundred fifty-one".