1320240551 has 16 divisors (see below), whose sum is σ = 1531984704. Its totient is φ = 1114331904.

The previous prime is 1320240529. The next prime is 1320240569. The reversal of 1320240551 is 1550420231.

It is not a de Polignac number, because 1320240551 - 2²⁶ = 1253131687 is a prime.

It is a super-2 number, since 2×1320240551² = 3486070225009567202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320248551) 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, 385121 + ... + 388533.

It is an arithmetic number, because the mean of its divisors is an integer number (95749044).

Almost surely, 2^1320240551 is an apocalyptic number.

1320240551 is a deficient number, since it is larger than the sum of its proper divisors (211744153).

1320240551 is an equidigital number, since it uses as much as digits as its factorization.

1320240551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4250.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1320240551 is about 36335.1145725454. The cubic root of 1320240551 is about 1097.0279415756.

Adding to 1320240551 its reverse (1550420231), we get a palindrome (2870660782).

The spelling of 1320240551 in words is "one billion, three hundred twenty million, two hundred forty thousand, five hundred fifty-one".